Crossword Genius

River of the underworld in Greek mythology (5)

Ross

I believe the answer is:

lethe

(Other definitions for lethe that I've seen before include "Mythological river in Hades" , "In Greek myth, the river of forgetfulness flowing through Hades" , "where elephants never drink?" , "Classical river of forgetfulness" , "River whose waters caused the souls of the dead to forget completely their life on Earth" .)

I've seen this clue in The Sunday Times and The Times.
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