Work to bring in a drama (4)
I believe the answer is:
play
'drama' is the definition.
('play' can be a synonym of 'drama')
'work to bring in a' is the wordplay.
'work' becomes 'ply' (I've seen this before**).
'to bring in' means one lot of letters goes inside another.
'ply' placed around 'a' is 'PLAY'.
(Other definitions for play that I've seen before include "Perform music" , "Slack - performance" , "Theatre performance" , "Work for actors" , "Hamlet, for example" .)