King's answer in poor winter apparel (8)
I believe the answer is:
knitwear
'apparel' is the definition.
(knitwear is a kind of apparel)
'king's answer in poor winter' is the wordplay.
'king' becomes 'k' (abbreviation for king in chess).
'answer' becomes 'a' (abbreviation eg in Q and A).
'in' indicates putting letters inside.
'poor' indicates anagramming the letters.
'winter' with letters rearranged gives 'nitwer'.
'a' put within 'nitwer' is 'nitwear'.
'k'+'nitwear'='KNITWEAR'
(Other definitions for knitwear that I've seen before include "that often covers blouses etc" , "I knew Art (anag)" , "Woollen items" , "Woollies" , "Woollen clothing" .)