Speedy writer (5)
I believe the answer is:
swift
I believe this clue is a double definition.
'speedy' is the first definition.
(I've seen this before)
'writer' is the second definition.
(Jonathan Swift, 1667-1745)
(Other definitions for swift that I've seen before include "Swallow-like bird" , "Fleet" , "Quick - writer" , "Bird; happening quickly" , "Anglo-Irish satirist" .)