Husband wearing suit in domestic circles (7)
I believe the answer is:
hearths
'domestic circles' is the definition.
(circles around fires)
'husband wearing suit' is the wordplay.
'husband' becomes 'h' (abbreviation).
'wearing' is an insertion indicator.
'suit' becomes 'hearts' (hearts is a playing card suit).
'h' going into 'hearts' is 'HEARTHS'.
'in' is the link.
(Other definitions for hearths that I've seen before include "Firesides" , "Fireplace areas" .)