Crossword Genius

Snake in devilish guise (7)

Ross

I believe the answer is:

serpent

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'snake' is the definition.
(synonyms)

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(Other definitions for serpent that I've seen before include "Early wind instrument" , "Limbless reptile" , "Large snake, dragon" , "Fruit supplier" , "Snake - old wind instrument" .)

I've seen this clue in the Evening Standard.
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