Bad actor allowed leading role (6)
I believe the answer is:
hamlet
'role' is the definition.
(I have seen 'tragic role' mean 'hamlet' so perhaps 'role' could also mean 'hamlet')
'bad actor allowed leading' is the wordplay.
'bad actor' becomes 'ham' (a ham is someone who overacts).
'allowed' becomes 'let' (to let is to allow or permit).
'leading' is a charade indicator (letters next to each other).
'ham'+'let'='HAMLET'
(Other definitions for hamlet that I've seen before include "famous title role" , "Small settlement" , "The Prince of Denmark's little village" , "Tiny village; Prince of Denmark" , "Small rural community" .)