Swift's forte
I believe the answer is:
satire
'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." .)