What does the cryptic crossword clue "Decisive blow upsetting old animal (4)" mean?

The definition is "Decisive blow". The wordplay uses charade, reversal. O (synonym of "old") + YAK (synonym of "animal") [reversal: "upsetting"]; definition: "Decisive blow" The answer is KAYO.

Decisive blow upsetting old animal (4)

Guardian Cryptic #29564 | 24 Down | 2024-12-12 flower

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