Floorshow featuring nude in improper act (7)
I believe the answer is:
cabaret
'floorshow' is the definition.
(synonyms)
'nude in improper act' is the wordplay.
'nude' becomes 'bare' (synonyms).
'in' means one lot of letters goes inside another.
'improper' indicates anagramming the letters.
'act' anagrammed gives 'cat'.
'bare' placed within 'cat' is 'CABARET'.
'featuring' is the link.
(Other definitions for cabaret that I've seen before include "Floor show for Arab etc" , "Revue" , "Bear cat (anag.)" , "Variety entertainment" , "Nightclub 12ac" .)