What does the cryptic crossword clue "First opportunity (7)" mean?

The definition is "First". The wordplay uses a charade (building blocks). OPENING (synonym of "opportunity"); definition: "First" The answer is OPENING.

First opportunity (7)

Guardian Cryptic #25225 | 28 Across | 2011-01-21 flower

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Also seen in

Telegraph #30911 (2025-04-26) Telegraph Prize Cryptic #3049 (2020-03-29)