"The Threepenny Opera" playwright (6)
I believe the answer is:
brecht
'the threepenny opera playwright' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for brecht that I've seen before include "Bertolt -, Ger. dramatist (Mother Courage)" , "German dramatist and librettist" , "Bertolt --, Ger. author" , "Bertolt --, German writer" , "German playwright, 1898-1956" .)