Young monk’s drama over wrong habit (6)
I believe the answer is:
novice
'young monk's' is the definition.
'drama over wrong habit' is the wordplay.
'drama' becomes 'no' (Noh or No is a Japanese masked drama).
'over' means one lot of letters go next to another.
'wrong habit' becomes 'vice'.
'no'+'vice'='NOVICE'
(Other definitions for novice that I've seen before include "Probationary nun/monk" , "Acolyte" , "Beginner, tyro" , "New starter" , "Noob" .)