What does the cryptic crossword clue "A class act (7)" mean?

The definition is "act". The wordplay uses a charade (building blocks). PER (synonym of "A") + FORM (synonym of "class"); definition: "act" The answer is Perform.

A class act (7)

Telegraph #29917 | 21 Across | 2022-02-22 flower

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Also seen in

Guardian Cryptic #28232 (2020-09-07)