One of Charon’s rivers (4)

I believe the answer is:

styx

(Other definitions for styx that I've seen before include "Underworld river ferried by Charon" , "Mythological river ferried by Charon" , "River Charon rowed on" , "Hellish current" , "Underworld river; sounds like remote area" .)

I've seen this clue in The Guardian.

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