Bertolt , dramatist whose stage plays include Mr Puntila and his Man Matti (6)
I believe the answer is:
brecht
(Other definitions for brecht that I've seen before include "Bertolt -, Ger. dramatist (Mother Courage)" , "Bertolt --, Ger. author" , "German dramatist and librettist" , "German dramatist and poet who wrote The Threepenny Opera, d.1956" , "Bertolt ....., great German playwright of ''Mother Courage' '" .)