Group of husbands (4)
I believe the answer is:
band
'group' is the definition.
(band can mean a group of people)
'of husbands' is the wordplay.
'of' indicates the answer is hidden within the clue.
'BAND' can be found hidden inside 'husbands'.
(Other definitions for band that I've seen before include "Loop; rock group" , "Outline drawing" , "Belt; group of musicians" , "company" , "Capital of Tibet" .)