What does the cryptic crossword clue "Become very warm when in decay (5)" mean?

The definition is "Become very warm". The wordplay uses a charade (building blocks). AS (synonym of "when") + ROT (synonym of "decay"); definition: "Become very warm" The answer is ROAST.

Become very warm when in decay (5)

Times Cryptic #28898 | 20 Across | 2024-04-23 flower

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