Crossword Genius

One married couple weaken (6)

Ross

I believe the answer is:

impair

'weaken' is the definition.
(I've seen this in another clue)

'one married couple' is the wordplay.
'one' becomes 'I' (Roman numeral).
'married' becomes 'm'.
'couple' becomes 'pair' (synonyms).
'i'+'m'+'pair'='IMPAIR'

(Other definitions for impair that I've seen before include "Harm" , "Damage or handicap" , "Weaken, damage" , "Spoil strength, quality of" , "Spoil, degrade" .)

I've seen this clue in The Times and The Sun.
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