Duty finds husband in the middle (5)
I believe the answer is:
chore
'duty' is the definition.
(chore is a kind of duty)
'husband in the middle' is the wordplay.
'husband' becomes 'h'.
'in the' is an insertion indicator.
'middle' becomes 'core'.
'h' put inside 'core' is 'CHORE'.
'finds' is the link.
(Other definitions for chore that I've seen before include "Unpleasant task" , "Manipulate; name" , "Boring task" , "Drudgery" , "A household or routine task" .)