Fish husband carried in vehicle (4)
I believe the answer is:
char
'fish' is the definition.
(char is a kind of fish)
'husband carried in vehicle' is the wordplay.
'husband' becomes 'h'.
'carried in' means one lot of letters goes inside another.
'vehicle' becomes 'car' (car is a kind of vehicle).
'h' placed into 'car' is 'CHAR'.
(Other definitions for char that I've seen before include "Partially burn; fish" , "Burn lightly" , "new island > fish with > prepared wood, say" , "Scorch: trout-like fish" , "tea > daily" .)