Husband in pleasant and appropriate situation (5)
I believe the answer is:
niche
'appropriate situation' is the definition.
(a situation suited to a particular individual)
'husband in pleasant' is the wordplay.
'husband' becomes 'h'.
'in' means one lot of letters goes inside another.
'pleasant' becomes 'nice' (similar in meaning).
'h' placed inside 'nice' is 'NICHE'.
'and' acts as a link.
(Other definitions for niche that I've seen before include "Suitable spot" , "Place that's cosy" , "small specialised market" , "Cosy spot" , "Particularly suitable position" .)