Quickly redrafted poster (6)
I believe the answer is:
presto
'quickly' is the definition.
(I've seen this before)
'redrafted poster' is the wordplay.
'redrafted' indicates an anagram (to redraft something is to improve or rewrite it).
'poster' anagrammed gives 'PRESTO'.
(Other definitions for presto that I've seen before include "Moving quickly" , "Hey ..., said the magician" , "quick to score" , "fast to the maximum" , "Very fast (mus.)" .)