So it is held by most husbands (4)
I believe the answer is:
thus
'so' is the definition.
(I know that so can be written as thus)
'held by most husbands' is the wordplay.
'held by' indicates the answer is hidden within the clue.
'THUS' can be found hidden inside 'most husbands'.
'it is' is the link.
(Other definitions for thus that I've seen before include "Like so" , "an original Christmas gift" , "Consequently" , "In this manner" , "as indicated" .)