Underworld river (4)

I believe the answer is:

styx

'underworld river' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for styx that I've seen before include "classical stream" , "One of the rivers of Hades" , "Underworld river; sounds like remote area" , "Charon's 26 carried dead souls across this river" , "River of hell" .)

I've seen this clue in the Universal, The Wall Street Journal, the Newsday and The Times.

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