River ferried by Charon (4)

I believe the answer is:

styx

'river ferried by charon' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in the New York Times, the Sydney Morning Herald, the Wall Street Journal and the King Feature Syndicate.

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