Cavorting nude essentially drunken adult chaperone (6)
I believe the answer is:
duenna
'chaperone' is the definition.
(duenna is a kind of chaperone)
'cavorting nude essentially drunken adult' is the wordplay.
'cavorting' is an anagram indicator.
'essentially' means to look at the middle letters.
'adult' becomes 'a'.
The middle of 'drunken' is 'n'.
'nude' is an anagram of 'duen'.
'duen'+'n'+'a'='DUENNA'
(Other definitions for duenna that I've seen before include "Iberian chaperone" , "Female chaperone" , "(Spanish) chaperone" , "governess in Spain" , "caring senora" .)