Vamp (4)
I believe the answer is:
minx
'vamp' is the definition.
(I know that vamp can be written as minx)
This is the entire clue.
(Other definitions for minx that I've seen before include "flirty girl" , "Impudent young girl" , "Seductive woman" , "Bold girl" , "Boldly flirtatious young woman" .)