Try being naughty over a nude (9)
I believe the answer is:
endeavour
'try' is the definition.
(I know that try can be written as endeavour)
'naughty over a nude' is the wordplay.
'naughty' indicates anagramming the letters.
'over'+'a'+'nude'='overanude'
'overanude' with letters rearranged gives 'ENDEAVOUR'.
'being' is the link.
(Other definitions for endeavour that I've seen before include "Try hard; enterprise" , "Try - Cook's ship" , "Strive - Inspector Morse's first name" , "Determined attempt" , "Captain Cook's first ship - DCI Morse's first name" .)