Nude is possibly requiring knickers (6)
I believe the answer is:
undies
'knickers' is the definition.
(underwear)
'nude is possibly' is the wordplay.
'possibly' indicates anagramming the letters.
'nude'+'is'='nudeis'
'nudeis' anagrammed gives 'UNDIES'.
'requiring' acts as a link.
(Other definitions for undies that I've seen before include "Undergarments (colloq.)" , "Used in (anag) -- unmentionables" , "Pants" , "Knickers (abbrev.)" , "Personal attire" .)