Swift's forte (6)
I believe the answer is:
'swift's forte' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for satire that I've seen before include "It holds up folly to ridicule" , "Witty language used to convey insults or scorn" , "Jonathan Swift's forte?" , "Language saying one thing but implying the opposite" , "Biting humour exposing vice, folly etc." .)