Brief satirical sketch (4)
I believe the answer is:
skit
'brief satirical sketch' is the definition.
(a skit is a short comedy sketch; 'brief' asks for an abbreviation)
This is the entire clue.
(Other definitions for skit that I've seen before include "Kits for funny play" , "take-off" , "Short comic piece" , "Comedy routine" , "Lampoon" .)