Husband sat around in headwear (4)
I believe the answer is:
hats
'headwear' is the definition.
(I've seen this before)
'husband sat around in' is the wordplay.
'husband' becomes 'h' (**).
'around' indicates anagramming the letters.
'in' indicates putting letters inside.
'sat' anagrammed gives 'ats'.
'h' placed within 'ats' is 'HATS'.
(Other definitions for hats that I've seen before include "Milliner's stock" , "Headdresses" , "Headgear" , ""Porkpie" and "pillbox" attire" , "Headwear" .)