Crossword Genius

Couple in one sea weakened (8)

Ross

I believe the answer is:

impaired

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'weakened' is the definition.
(similar in meaning)

I don't understand the remainder of the clue.

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(Other definitions for impaired that I've seen before include "Spoiled" , "Caused weakening, damaged" , "Spoilt" , "Had negative impact" , "Defective" .)

I've seen this clue in The Sun.
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