Charlie Brown's sister (5)
I believe the answer is:
sally
'charlie brown's sister' 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 "Sarah might make a witty remark about the willow" , "- - Lunn, flat cake" , "army" , "Charge" , "Sortie; quip" .)