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 a hidden word.
'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" .)