What does the cryptic crossword clue "Opera house provided extract of Tosca last year (5)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Opera house provided extract of Tosca last year (5)

Guardian Cryptic #24768 | 23 Down | 2009-08-03 flower

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