Husband enters to wreck party (6)
I believe the answer is:
thrash
'party' is the definition.
(informal term for a party)
'husband enters to wreck' is the wordplay.
'husband' becomes 'h'.
'enters' is an insertion indicator.
'to wreck' becomes 'trash' (I've seen this in another clue).
'h' inserted within 'trash' is 'THRASH'.
(Other definitions for thrash that I've seen before include "Administer sound beating to" , "Administer severe beating to" , "Beat heavily, perhaps with whip" , "Flog; party" , "worst > party" .)