Mythical river of Hades (4)

I believe the answer is:

styx

(Other definitions for styx that I've seen before include "Underworld river ferried by Charon" , "Hellish current" , "Infernal runner" , "Hell's river" , "One of the underworld rivers" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.