Nude in no improper suggestion (8)
I believe the answer is:
innuendo
'suggestion' is the definition.
(I've seen this before)
'nude in no improper' is the wordplay.
'improper' is an anagram indicator.
'nude'+'in'+'no'='nudeinno'
'nudeinno' anagrammed gives 'INNUENDO'.
(Other definitions for innuendo that I've seen before include "Insinuation - suggestion" , "Suggestive allusion" , "Indirect implication" , "Indirect reference to something rude" , "suggested" .)