I’m covered in paint playing drums (7)
I believe the answer is:
timpani
'drums' is the definition.
(type of drums)
'i'm covered in paint playing' is the wordplay.
'covered in' is an insertion indicator.
'playing' indicates anagramming the letters.
'paint' with letters rearranged gives 'tpani'.
'im' placed inside 'tpani' is 'TIMPANI'.
(Other definitions for timpani that I've seen before include "PM, I ain't (anag.)" , "orchestra members" , "Percussion instrument" , "Those beaten" , "set of instruments" .)