Crossword Genius

Vipers with upturned snouts (4)

Ross

I believe the answer is:

asps

(Other definitions for asps that I've seen before include "Poplars" , "Pass among snakes" , "Cleopatra's snakes" , "Poisonous snakes" , "Poisonous creepers" .)

I've seen this clue in the New York Times.
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