Femme fatale lied disgracefully and upset prince (7)
I believe the answer is:
delilah
'femme fatale' is the definition.
(I've seen this before)
'lied disgracefully and upset prince' is the wordplay.
'disgracefully' indicates anagramming the letters.
'and' is a charade indicator (letters next to each other).
'upset' says the letters should be written backwards.
'prince' becomes 'hal' (I've seen this before**).
'hal' in reverse letter order is 'lah'.
'lied' with letters rearranged gives 'deli'.
'deli'+'lah'='DELILAH'
(Other definitions for delilah that I've seen before include "Samson's false girl-friend" , "Tom Jones single" , "Samson's treacherous girl friend" , "Biblical temptress" , "Judges woman" .)