Crossword Genius

Common viper (5)

Ross

I believe the answer is:

adder

'common viper' is the definition.
(synonyms)

This is all the clue.

(Other definitions for adder that I've seen before include "Totting snake" , "He's making an extension" , "British snake; summer" , "Poisonous Brit. snake" , "One creature" .)

I've seen this clue in The Mirror, the Sydney Morning Herald and The Telegraph.
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