Short comedy sketch (4)
I believe the answer is:
skit
'short comedy sketch' is the definition.
(a short comedy performance; 'short' indicates a short form)
This is the entire clue.
(Other definitions for skit that I've seen before include "satirical observation" , "Short satirical piece" , "piece of satire" , "Short comic piece" , "Short play which makes fun of something" .)