"The Plough and the Stars” playwright (6)
I believe the answer is:
ocasey
'the plough and the stars playwright' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ocasey that I've seen before include "Sean ..., author of 'The Plough and the Stars'" , "Sean . . . . . ., great Irish playwright of 'The Plough and the Stars' (1'5)" , "one connected with The Abbey" , "Sean . . . . . . wrote ''The Plough and the Stars'' (1 '5)" , "Sean . . . . . . wrote 'Juno and the Paycock'" .)