Femme fatale's make up (4)
I believe the answer is:
vamp
I believe this is a double definition.
'femme fatale's' is the first definition.
(both can mean a seductive woman)
'make up' is the second definition.
(vamping is a kind of making up)
(Other definitions for vamp that I've seen before include "Unsophisticated musical improvisation" , "Improvise unskilfully" , "Femme fatale" , "Jazzy passage - temptress" , "Female seducer" .)