Opera by Britten (5,6)
I believe the answer is:
peter grimes
'opera by britten' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for peter grimes that I've seen before include "outcast fisherman" , "noted fisherman" , "Britten's fisherman opera" , "Opera by Benjamin Britten" , "Britten's loner fisherman" .)