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

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

Spoil one married couple (6)

Daily Mail Cryptic #16435 | 8 Down | 2020-10-29 flower

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