Buddhist monk taking in sinful erotic dance (7)
I believe the answer is:
lambada
'erotic dance' is the definition.
(I've seen this before)
'buddhist monk taking in sinful' is the wordplay.
'buddhist monk' becomes 'lama' (as in the Dalai Lama).
'taking in' is an insertion indicator.
'sinful' becomes 'bad'.
'lama' enclosing 'bad' is 'LAMBADA'.
(Other definitions for lambada that I've seen before include "dance in South America" , "Fast Brazilian dance - mad Baal (anag)" , "number of Brazilian revellers" , "sexy dance" , "Erotic Brazilian dance" .)