But it's a dramatic work! (4)
I believe the answer is:
play
'dramatic work' is the definition.
(play is a kind of dramatic work)
'but it's a' is the wordplay.
I cannot quite understand how this works, but
'a' is found in the answer.
The remaining letters 'ply' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
(Other definitions for play that I've seen before include "Drama; engage in games" , "Theatre production" , "Drama - latitude - sport" , "Uncle's premises" , "Stage drama" .)