New act involves nude entertainment (7)
I believe the answer is:
cabaret
'entertainment' is the definition.
(I know that cabaret is a type of tavern)
'new act involves nude' is the wordplay.
'new' indicates an anagram.
'involves' means one lot of letters goes inside another.
'nude' becomes 'bare' (synonyms).
'act' is an anagram of 'cat'.
'cat' going around 'bare' is 'CABARET'.
(Other definitions for cabaret that I've seen before include "Liza Minnelli's entertainment?" , "Entertainment at night club" , "Entertainment provided in a nightclub" , "Floor-show as in nightclub" , "Nightclub 12ac" .)