Speedy old satirist (5)
I believe the answer is:
swift
I believe this is a double definition.
'speedy' is the first definition.
(I've seen this before)
'old satirist' is the second definition.
(I know that Swift is a satirist)
(Other definitions for swift that I've seen before include "Speedy - bird like a swallow" , "Happening quickly; author" , "A bird; Gulliver author" , "writer of satire" , "Anglo-Irish satirist" .)