Crossword Genius

Underworld river (4)

Ross

I believe the answer is:

styx

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">underworld river</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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 Times, the Newsday, the Universal and The Wall Street Journal.
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