Crossword Genius

Common vipers (6)

Ross

I believe the answer is:

adders

'common vipers' is the definition.
('adder' can be a synonym of 'common viper')

This is the entire clue.

(Other definitions for adders that I've seen before include "Do they deal with tots" , "Arithmetic snakes?" , "Small vipers" , "Mathematical reptiles" , "at the zoo?" .)

I've seen this clue in The Mirror.
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