Comic's material (4)
I believe the answer is:
gags
'comic's material' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for gags that I've seen before include "Muzzles or jokes." , "Muffles with slangy jokes" , "Prevents from speaking the jokes" , "Jokes - silences" , "One-liners" .)