Samson's betrayer (7)
I believe the answer is:
delilah
'samson's betrayer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for delilah that I've seen before include "Judges woman" , "tempting girl" , "See 8 across" , "Samson's femme fatale" , "She sheared Samson" .)