What does the cryptic crossword clue "Spoil one married couple (6)" mean?

The definition is "Spoil". The wordplay uses a charade (building blocks). I (synonym of "one") + M (synonym of "married") + PAIR (synonym of "couple"); definition: "Spoil" The answer is Impair.

Spoil one married couple (6)

Telegraph #30216 | 3 Down | 2023-02-06 flower

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