Crossword Genius

— River, US watercourse forming part of the border between Idaho and Oregon (5)

Ross

I believe the answer is:

snake

(Other definitions for snake that I've seen before include "Carnivorous reptile" , "Chinese zodiac animal" , "Serpent" , "Part of plant or hair" , "Long slender reptile" .)

I've seen this clue in The Mirror.
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