UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED
MANAGEMENT INVESTMENT COMPANIES

ITEM 1.                  REPORT TO STOCKHOLDERS.

The Semi-Annual Report to Stockholders is filed herewith.

Semi-Annual Report

Western Asset/Claymore Inflation-Linked Securities & Income Fund
(WIA)

Investment objectives

The Fund’s primary investment objective is to provide current income. Capital appreciation, when consistent with current income, is a secondary investment objective.

What’s inside

Letter to shareholders

Dear Shareholder,

We thank you for your investment in Western Asset/Claymore Inflation-Linked Securities & Income Fund. As investment adviser for the Fund, we are pleased to submit the Fund’s semi-annual shareholder report for the six-month reporting period ended June 30, 2010.

For the six months ended June 30, 2010, the Fund returned 4.54% based on its net asset value (“NAV”)i and 4.48% based on its New York Stock Exchange (“NYSE”) market price per share. The Fund’s unmanaged benchmarks, the Barclays U.S. Government Inflation-Linked 1-10 Year Indexii and the Barclays U.S. Government Inflation-Linked All Maturities Indexiii, returned 3.13% and 4.42%, respectively, for the same period. The Barclays World Government Inflation-Linked All Maturities Indexiv and the Fund’s Custom Benchmarkv returned -2.68% and 4.54%, respectively, over the same time frame. All Fund returns cited—whether based on NAV or market price—assume the reinvestment of all distributions. Past performance does not guarantee future results. The market price of the Fund’s shares fluctuates from time to time, and it may be higher or lower than the Fund’s NAV.

The largest contributor to the Fund’s absolute performance for the period was our large exposure to U.S. Treasury Inflation-Protected Securities (“TIPS”)vi. Treasury yields generally fell over the period as various federal stimulus programs, initiated in response to the financial crisis, significantly increased the national debt. Investors, worried that this deficit spending would spur inflation, sought protection by purchasing TIPS. An exposure to non-agency securities also positively impacted performance as prices in the sector were bolstered by government programs (such as the Public-Private Investment Program), improved liquidity, strong paydowns, generally improving housing news and the growing sentiment that a bottom in the housing market had been established. Exposure to both investment grade credit and high-yield securities was additive to performance given the narrowing of spreads on the back of strong corporate earnings.

The Fund’s exposure to several U.S. agency positions was a modest detractor from performance for the period.

The portfolio also employed several types of derivatives: both futures and options on futures for U.S. Treasuries to manage durationvii and yield curveviii exposure; Eurodollar futures and Eurodollar future options to manage exposure to short-term rates; Euro-Bobl futures to manage exposure to intermediate German rates; and credit default swaps to manage exposure to a particular corporate issuer. Over the period, the impact of the Treasury and Eurodollar derivatives, as well as the credit derivatives, was slightly positive. Foreign exchange exposure also paid off, with gains from positions in the Australian dollar, the euro and the pound offsetting losses from the Canadian dollar and the Japanese yen.

As of June 30, 2010, the Fund’s market price of $12.62 per share represented a discount of 4.39% to its NAV of $13.20 per share. During the first six months of 2010, the Fund provided its investors with monthly distributions of $0.038 per share. The most recent dividend represents an annualized distribution rate of 3.61% based on the Fund’s closing market price of $12.62 on June 30, 2010.

The Fund’s investment objective is to provide current income. Capital appreciation, when consistent with current income, is a secondary objective. Under normal market conditions, the Fund will invest:

·  At least 80% of its total managed assets in inflation-linked securities

·  At least 60% of its total managed assets in TIPS

·  No more than 40% of its total managed assets in non-U.S. dollar investments, which gives the Fund the flexibility to invest up to 40% of its total managed assets in non-U.S. dollar inflation-linked securities (no more than 20% of its non-U.S. dollar exposure may be unhedged)

The Fund continues its policy of not investing in bonds that are below investment grade quality at the time of purchase. Up to 20% of the Fund’s portfolio securities may represent corporate debt securities of investment grade quality at the time of their purchase that are not inflation-linked securities. The Fund currently expects that the average effective duration of its portfolio will range between zero and fifteen years, although this target duration may change from time to time. The Fund expects to continue its use of credit default swaps.

Shareholders have the opportunity to reinvest their dividends from the Fund through the Dividend Reinvestment Plan (“DRIP”), which is described in detail on page 2 of this report. If shares are trading at a discount to NAV, the DRIP takes advantage of the discount by reinvesting the monthly dividend distribution in common shares of the Fund purchased in the market at a price less than NAV. Conversely, when the market price of the Fund’s common shares is at a premium above NAV, the DRIP reinvests participants’ dividends in newly-issued common shares at NAV, subject to an IRS limitation that the purchase price cannot be more than 5% below the market price per share. The DRIP provides a cost-effective means to accumulate additional shares.

We appreciate your investment and look forward to serving your investment needs in the future. For the most up-to-date information on your investment, please visit the Fund’s website at www.claymore.com/wia.

Sincerely,

Western Asset Management Company

July 16, 2010

Investment commentary

Economic review

While the overall U.S. economy continued to expand over the six months ended June 30, 2010, several economic data points weakened toward the end of the reporting period. This, in combination with sovereign debt woes in Europe, caused investor sentiment to turn negative and had significant implications for the financial markets.

Looking back, the U.S. Department of Commerce reported that U.S. gross domestic product (“GDP”)i contracted four consecutive quarters, beginning in the third quarter of 2008 through the second quarter of 2009. Economic conditions then began to improve in the third quarter of 2009, as GDP growth was 1.6%. A variety of factors helped the economy to regain its footing, including the government’s $787 billion stimulus program. Economic growth then accelerated during the fourth quarter of 2009, as GDP growth was 5.0%. A slower drawdown in business inventories and renewed consumer spending were contributing factors spurring the economy’s higher growth rate. While the recovery continued during the first half of 2010, it did so at a more modest pace, as GDP growth was 3.7% during the first quarter of 2010 and an estimated 2.4% during the second quarter. The slower pace of growth in the second quarter was due, in part, to slower consumer spending, which rose an annualized 1.6% during the quarter, versus a 1.9% gain over the first three months of the year.

Even before GDP growth turned positive, there were signs that the economy was on the mend. The manufacturing sector, as measured by the Institute for Supply Management’s PMIii, rose to 52.8 in August 2009, the first time it surpassed 50 since January 2008 (a reading below 50 indicates a contraction, whereas a reading above 50 indicates an expansion). While June 2010’s PMI reading of 56.2 was lower than May’s reading of 59.7, manufacturing has now expanded eleven consecutive months according to PMI data. The manufacturing sector’s growth remained fairly broad-based with thirteen of the eighteen industries tracked by the Institute for Supply Management expanding during June.

After experiencing sharp job losses in 2009, the U.S. Department of Labor reported that over one million new positions were added during the first five months of 2010. Included in that total, however, were 700,000 temporary government jobs tied to the 2010 Census. In June, 225,000 of these temporary positions were eliminated, offsetting private sector growth and resulting in a net loss of 125,000 jobs for the month. However, the unemployment rate fell to 9.5% in June, versus 9.7% and 9.9% in May and April, respectively.

There was mixed news in the housing market during the period. According to the National Association of Realtors, existing home sales increased 7.0% and 8.0% in March and April, respectively, after sales had fallen for the period from December 2009 through February 2010. The rebound was largely attributed to people rushing to take advantage of the government’s $8,000 tax credit for first-time home buyers that expired at the end of April. However, with the end of the tax credit, existing home sales then declined 2.2% and 5.1% in May and June, respectively. In addition, the inventory of unsold homes increased 2.5% to 3.99 million in June. Looking at home prices, the S&P/Case-Shiller Home Price Indexiii indicated that month-to-month U.S. home prices rose 1.3% in May. This marked the second straight monthly increase following six consecutive months of declining prices.

Financial market overview

During the first half of the reporting period, the financial markets were largely characterized by healthy investor risk appetite and solid results by lower-quality bonds. However, the market experienced a sharp sell-off during the second half of the reporting period, during which risk aversion returned and investors flocked to the relative safety of U.S. Treasury securities.

Given certain pockets of weakness in the economy, including elevated unemployment in the U.S., the Federal Reserve Board (“Fed”)iv remained cautious. At its meeting in June 2010, the Fed said it “will maintain the target range for the federal funds ratev at 0 to 1/4 percent and continues to anticipate that economic conditions, including low rates of resource utilization, subdued inflation trends, and stable inflation expectations, are likely to warrant exceptionally low levels of the federal funds rate for an extended period.”

However, the Fed took several steps in reversing its accommodative monetary stance. On February 18, 2010, the Fed raised the discount

rate, the interest rate it charges banks for temporary loans, from 1/2 to 3/4 percent. The Fed also concluded its $1.25 trillion mortgage securities purchase program at the end of the first quarter of 2010. However, the Fed left the door open for future stimulus measures if needed. In the minutes of its June meeting that were released on July 14th (after the reporting period ended), the Fed said, “In addition to continuing to develop and test instruments to exit from the period of unusually accommodative monetary policy, the Committee would need to consider whether further policy stimulus might become appropriate if the outlook were to worsen appreciably.”

Fixed-income market review

Continuing the trend that began in the second quarter of 2009, nearly every spread sector (non-Treasury) outperformed equal-durationvi Treasuries during the first half of the reporting period. Over that time, investor confidence was high given encouraging economic data, continued low interest rates, benign inflation and rebounding corporate profits. However, robust investor appetite was replaced with heightened risk aversion toward the end of April and during the month of May. This was due to the escalating sovereign debt crisis in Europe, uncertainties regarding new financial reforms in the U.S. and some worse-than-expected economic data. Most spread sectors then produced positive absolute returns in June, as investor demand for these securities began to again increase.

Both short- and long-term Treasury yields fluctuated during the period but generally moved lower. When the period began, two- and ten-year Treasury yields were 1.14% and 3.85%, respectively. Two- and ten-year Treasury yields initially rose, reaching as high as 1.18% and 4.01%, respectively, in early April. Yields then largely declined amid the investor “flight to quality.” On June 30, 2010, two- and ten-year Treasury yields reached their lows for the reporting period: 0.61% and 2.97%, respectively. Over the six-month reporting period, the yield curvevii flattened, with longer-term Treasury yields declining more than their shorter-term counterparts. For the six months ended June 30, 2010, the Barclays Capital U.S. Aggregate Indexviii returned 5.33%.

Inflation generally remained well-contained during the reporting period. For the six months ended June 30, 2010, the seasonally adjusted rate of inflation, as measured by the Consumer Price Index for All Urban Consumers (“CPI-U”)ix, was -0.3%. The CPI-U less food and energy was a modest 0.6% over the same time frame. Elsewhere, there were mixed signals regarding potential future inflation. The price of gold, which is often a signal of rising prices, reached an all-time high of $1,266 an ounce during the second quarter of 2010. In contrast, the price of oil fell approximately 10% during the second half of the reporting period.x Despite modest inflation, inflation-protected securities generated a positive return during the six months ended June 30, 2010, with the Barclays U.S. Government Inflation-Linked All Maturities Indexxi returning 4.42%.

Performance review

For the six months ended June 30, 2010, Western Asset/Claymore Inflation-Linked Securities & Income Fund returned 4.54% based on its net asset value (“NAV”)xii and 4.48% based on its New York Stock Exchange (“NYSE”) market price per share. The Fund’s unmanaged benchmarks, the Barclays U.S. Government Inflation-Linked 1-10 Year Indexxiii and the Barclays U.S. Government Inflation-Linked All Maturities Index, returned 3.13% and 4.42%, respectively, over the same time frame. The Barclays World Government Inflation-Linked All Maturities Indexxiv and the Fund’s Custom Benchmarkxv returned -2.68% and 4.54%, respectively, for the same period.

During this six-month period, the Fund made distributions to shareholders totaling $0.23 per share, which may have included a return of capital. The performance table shows the Fund’s six-month total return based on its NAV and market price as of June 30, 2010. Past performance is no guarantee of future results.

Performance Snapshot as of June 30, 2010

All figures represent past performance and are not a guarantee of future results.

* Total returns are based on changes in NAV or market price, respectively. Total returns assume the reinvestment of all distributions, including returns of capital, if any, in additional shares. Performance figures for periods shorter than one year represent cumulative figures and are not annualized.

Investment commentary (cont’d)

Western Asset Management Company

July 30, 2010

RISKS: Bonds are subject to a variety of risks, including interest rate, credit and inflation risk. As interest rates rise, bond prices fall, reducing the value of a fixed-income investment’s price. The Fund is subject to the additional risks associated with inflation-protected securities, including liquidity risk, prepayment risk, extension risk and deflation risk. Investments in foreign companies, including emerging markets, involve risks beyond those inherent solely in domestic investments. Leverage may cause a fund to be more volatile than if the fund had not been leveraged, which may increase the risk of investment loss. To the extent that the Fund invests in asset-backed, mortgage-backed or mortgage-related securities, its exposure to prepayment and extension risks may be greater than investments in other fixed-income securities. International investments are subject to currency fluctuations, social, economic and political risk. These risks are magnified in emerging markets.

All investments are subject to risk including the possible loss of principal. All index performance reflects no deduction for fees, expenses or taxes. Please note that an investor cannot invest directly in an index.

The information provided is not intended to be a forecast of future events, a guarantee of future results or investment advice. Views expressed may differ from those of the firm as a whole.

Fund highlights (unaudited)

The Fund

Western Asset/Claymore Inflation-Linked Securities & Income Fund (WIA or the Fund) is a diversified, closed-end management investment company which seeks to provide current income for its shareholders. Capital appreciation, when consistent with current income, is a secondary investment objective. Substantially all of the Fund’s net investment income (after payment of any interest expense in connection with forms of leverage (if applicable)) is distributed to the Fund’s shareholders. A Dividend Reinvestment Plan is available to those shareholders of record desiring to participate in it. The Fund’s common shares are listed on the New York Stock Exchange (NYSE) where they are traded under the symbol WIA.

Fund performance

Total return for the Fund for various periods ended June 30 are presented below, along with those of comparative indices.

The performance data quoted represents past performance and does not guarantee future results. Current performance may be lower or higher than the performance data quoted. The investment return and principal value of the Fund will fluctuate so that an investor’s shares, when sold, may be worth more or less than the original cost. Calculations assume reinvestment of dividends and capital gain distributions. Performance figures for periods shorter than one year represent cumulative figures and are not annualized.

Fund highlights (unaudited) (cont’d)

Investment policies

The Fund’s investment policies provide that under normal market conditions and at the time of purchase, its portfolio will be invested as follows:

·  At least 80% of its total managed assets6 in inflation-linked securities

·  At least 60% of its total managed assets in U.S. Treasury Inflation-Protected Securities

·  No more than 40% of its total managed assets in non-U.S. dollar investments (no more than 20% of its non-U.S. dollar exposure may be unhedged)

Each of the foregoing policies is a non-fundamental policy that may be changed without shareholder approval. The Fund has also adopted the following non-fundamental policy, which, to the extent required by applicable law, may only be changed after notice to shareholders: under normal market conditions, the Fund will invest at least 80% of its total managed assets in inflation protected securities and non-inflation protected securities and instruments with the potential to enhance the Fund’s income.

Up to 20% of the Fund’s portfolio securities may represent corporate debt securities of investment-grade quality at the time of their purchase that are not inflation-linked securities. In addition, to the extent permitted by the foregoing policies, the Fund may invest in emerging market debt securities. Reverse repurchase agreements and other forms of leverage will not exceed 38% of the Fund’s total managed assets.

Dividend reinvestment plan

The Fund and American Stock Transfer & Trust Company LLC (“Agent”), as the Transfer Agent and Registrar of WIA, offer a convenient way to add shares of WIA to your account. WIA offers to all common shareholders a Dividend Reinvestment Plan (“Plan”). Under the Plan, cash distributions (e.g., dividends and capital gains) on the common shares are automatically invested in shares of WIA unless the shareholder elects otherwise by contacting the Agent at the address set forth below.

As a participant in the Dividend Reinvestment Plan, you will automatically receive your dividend or net capital gains distribution in newly issued shares of WIA, if the market price of the shares on the date of the distribution is at or above the net asset value (NAV) of the shares, minus estimated brokerage commissions that would be incurred upon the purchase of common shares on the open market. The number of shares to be issued to you will be determined by dividing the amount of the cash distribution to which you are entitled (net of any applicable withholding taxes) by the greater of the NAV per share on such date or 95% of the market price of a share on such date. If the market price of a share on such distribution date is below the NAV, less estimated brokerage commissions that would be incurred upon the purchase of common shares on the open market, the Agent will, as agent for the participants, buy shares of WIA through a broker on the open market. All common shares acquired on your behalf through the Plan will be automatically credited to an account maintained on the books of the Agent.

Additional information regarding the plan

WIA will pay all costs applicable to the Plan, except for brokerage commissions for open market purchases by the Agent under the Plan, which will be charged to participants. All shares acquired through the Plan receive voting rights and are eligible for any stock split, stock dividend, or other rights accruing to shareholders that the Board of Trustees may declare.

You may terminate participation in the Plan at any time by giving notice to the Agent. Such termination will be effective prior to the record date next succeeding the receipt of such instructions or by a later date of termination specified in such instructions. Upon termination, a participant will receive a certificate for the full shares credited to his or her account or may request the sale of all or part of such shares. Fractional shares credited to a terminating account will be paid for in cash at the current market price at the time of termination.

6  “Total managed assets” means the total assets of the Fund (including any assets attributable to leverage) minus accured liabilities (other than liabilities representing leverage).

Dividends and other distributions invested in additional shares under the Plan are subject to income tax just as if they had been received in cash. After year end, dividends paid on the accumulated shares will be included in the Form 1099-DIV information return to the Internal Revenue Service and only one Form 1099-DIV will be sent to participants each year.

Inquiries regarding the Plan, as well as notices of termination, should be directed to American Stock Transfer & Trust Company LLC, 59 Maiden Lane, New York, NY 10038. Investor Relations telephone number 1-888-888-0151.

Schedule of portfolio holdings

The Fund files its complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year on Form N-Q. You may obtain a free copy of the Fund’s Form N-Q by calling 1-800-345-7999, by visiting the Fund’s website (http://www.westernclaymore.com), or by writing to the Fund, or you may obtain a copy of this report (and other information relating to the Fund) from the SEC’s website (http://www.sec.gov). Additionally, the Fund’s Form N-Q can be viewed or copied at the SEC’s Public Reference Room in Washington D.C. Information about the operation of the Public Reference Room can be obtained by calling 1-800-SEC-0330.

Proxy voting

You may request a free description of the policies and procedures that the Fund uses to determine how proxies relating to the Fund’s portfolio securities are voted by calling 1-800-345-7999 or by writing to the Fund, or you may obtain a copy of these policies and procedures (and other information relating to the Fund) from the SEC’s website (http://www.sec.gov). You may request a free report regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30, by calling 1-800-345-7999 or by writing to the Fund, or you may obtain a copy of this report (and other information relating to the Fund) from the SEC’s website (http://www.sec.gov).

Fund at a glance† (unaudited)

Standard & Poor’s Debt Ratings1 (at market value) — June 30, 2010

Sector Schedule2 (at market value) — June 30, 2010

Quarterly comparison of market price and net asset value (NAV), discount or premium to NAV and average daily volume of shares traded (unaudited)

Spread duration (unaudited)

Economic Exposure — June 30, 2010

Spread duration is defined as the change in value for a 100 basis point change in the spread relative to Treasuries. The spread over Treasuries is the annual risk-premium demanded by investors to hold non-Treasury securities. This chart highlights the market sector exposure of the Fund’s portfolio and the exposure relative to the selected benchmark as of the end of the reporting period.

Effective duration (unaudited)

Interest Rate Exposure — June 30, 2010

Effective duration is defined as the change in value for a 100 basis point change in Treasury yields. This chart highlights the interest rate exposure of the Fund’s portfolio relative to the selected benchmark as of the end of the reporting period.

Schedule of investments (unaudited)

June 30, 2010

Western Asset/Claymore Inflation-Linked Securities & Income Fund

See Notes to Financial Statements

Western Asset/Claymore Inflation-Linked Securities & Income Fund

See Notes to Financial Statements

Schedule of investments (unaudited) (cont’d)

June 30, 2010

Western Asset/Claymore Inflation-Linked Securities & Income Fund

See Notes to Financial Statements

Western Asset/Claymore Inflation-Linked Securities & Income Fund

See Notes to Financial Statements

Statement of assets and liabilities (unaudited)

June 30, 2010

See Notes to Financial Statements

Statement of operations (unaudited)

For the Six Months Ended June 30, 2010