Husband enters drunk, scratching bottom and something else in his trousers (5)
I believe the answer is:
thigh
'husband enters drunk scratching bottom and something else in his trousers' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'drunk scratching bottom and something else in his trousers' is the wordplay.
I cannot really see how this works, but
'drunk' could be 'high' (I've seen this before) and 'high' is located in the answer.
A single letter 't' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
(Other definitions for thigh that I've seen before include "Leg between knee and hip" , "This bone is the femur" , "Upper joint of the leg" , "Part of member" , "top of pin" .)