Quick witticism (5)
I believe the answer is:
sally
'quick witticism' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sally that I've seen before include "Sortie; witty retort" , "- - Lunn, flat cake" , "excursion" , "Go out" , "Set out - girl's name" .)