Wife to moan about another (5)
I believe the answer is:
woman
'wife' is the definition.
(I've seen this in another clue)
'moan about another' is the wordplay.
I cannot quite see how this works, but
an anagram of 'moan' is 'oman' which is within the answer.
A single letter 'w' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Other definitions for woman that I've seen before include "With 1a [NEW] a freedom fighter" , "Mature female" , "With 1a [OLD], one's rather timid" , "Lady" , "See 16" .)