Girl's quip (5)
I believe the answer is:
sally
I believe this clue is a double definition.
'girl's' is the first definition.
(feminine given name)
'quip' is the second definition.
(synonyms)
(Other definitions for sally that I've seen before include "Sarah might make a witty remark about the willow" , "excursion" , "Retort - Gracie Fields song" , "trip" , "Witty riposte" .)