Couple in one sea weakened (8)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
impaired
(Other definitions for impaired that I've seen before include "Spoiled" , "Caused weakening, damaged" , "Spoilt" , "Had negative impact" , "Defective" .)
I believe the answer is:
impaired
(Other definitions for impaired that I've seen before include "Spoiled" , "Caused weakening, damaged" , "Spoilt" , "Had negative impact" , "Defective" .)