Somehow Mrs King must win holiday gear for Mr King (8,6)
I believe the answer is:
swimming trunks
'holiday gear for mr king' is the definition.
(items worn by a man)
'somehow mrs king must win' is the wordplay.
'somehow' is an anagram indicator.
'mrs'+'king'+'must'+'win'='mrskingmustwin'
'mrskingmustwin' with letters rearranged gives 'SWIMMING-TRUNKS'.
(Other definitions for swimming trunks that I've seen before include "Beachwear" , "skimpy gear" .)