Roman female oracle (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
sibyl
(Other definitions for sibyl that I've seen before include "Seer in classical times" , "Female oracle" , "Seeress; Mrs. Fawlty" , "Greek prophetess" , "Woman mouthpiece of a god, uttering prophecies" .)