Well-balanced wife maybe — or a nag? (10)
I believe the answer is:
stablemate
'a nag?' is the definition.
(I've seen this before)
'well-balanced wife' is the wordplay.
'well balanced' becomes 'stable' (I've seen this before).
'wife' becomes 'mate' (I've seen this in another clue).
'stable'+'mate'='STABLEMATE'
'maybe or' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for stablemate that I've seen before include "Maybe fellow Arab" , "One from the same organisation or background" , "person in same outfit" , "One from the same organisation as another" , "someone from same place" .)