Hasty author (5)
I believe the answer is:
swift
This clue is a double definition.
'hasty' is the first definition.
(I've seen this before)
'author' is the second definition.
(I've seen this before)
(Other definitions for swift that I've seen before include "wit?" , "Hasty" , "Quick Irish satirist?" , "Quick - writer" , "Speedy - bird like a swallow" .)