What does the cryptic crossword clue "Sort of wave presented at cup match in decisive moment (10)" mean?

The definition is "decisive moment". The wordplay uses a charade (building blocks). TIE (synonym="cup match") + BREAKER (synonym="Sort of [sea] wave") = TIEBREAKER; definition: "decisive moment" The answer is TIEBREAKER.

Sort of wave presented at cup match in decisive moment (10)

Guardian Cryptic #29047 | 8 Down | 2023-04-18 flower

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