Form of humor (6)
I believe the answer is:
satire
'form of humor' is the definition.
(I know that satire is a type of humor)
This is the entire clue.
(Other definitions for satire that I've seen before include "Humorous criticism of folly or vice" , "Pointed humour" , "Humerous literary ridicule" , "Use of irony in writing" , "Jonathan Swift's forte?" .)