Greek prophetess (5)
I believe the answer is:
sibyl
'greek prophetess' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for sibyl that I've seen before include "One seeing future" , "Ancient Roman prophetess" , "Woman mouthpiece of a god, uttering prophecies" , "Charmer" , "Ancient seer - prophetess" .)