Act seductively (4)
I believe the answer is:
vamp
'act seductively' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for vamp that I've seen before include "Playing, improvise" , "Female seducer" , "Predatory woman" , "Femme fatale" , "Seductress; improvise" .)