River of 1-Across (4)

I believe the answer is:

styx

(Other definitions for styx that I've seen before include "River separating Earth from Hades" , "Underworld river ferried by Charon" , "River of hell" , "Underworld river; sounds like remote area" , "Mythological river in Hades" .)

I've seen this clue in the King Feature Syndicate.

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