Won't appear in the nude turn, which is unusual (8)
I believe the answer is:
unwonted
'is unusual' is the definition.
(thesaurus)
'won't appear in the nude turn' is the wordplay.
'appear in' indicates putting letters inside.
'turn' indicates an anagram.
'nude' anagrammed gives 'uned'.
'wont' put into 'uned' is 'UNWONTED'.
'which' is the link.
(Other definitions for unwonted that I've seen before include "Unaccustomed" , "Not characteristic" , "not typical" , "Atypical, not usual" , "Not habitually" .)