She's attractive and dangerous seller of foreign food (the French horse) (7)
I believe the answer is:
delilah
'she's attractive and dangerous' is the definition.
'seller of foreign food the french horse' is the wordplay.
'seller of foreign food' becomes 'deli'.
'the french' becomes 'la' ('the' in French).
'horse' becomes 'h' (synonyms).
'deli'+'la'+'h'='DELILAH'
(Other definitions for delilah that I've seen before include "Biblical betrayer" , "Tom Jones song" , "Seductive woman" , "Samson's false girl-friend" , "Samson's femme fatale" .)