Crossword Genius

The only native venomous snakes in the UK (6)

Ross

I believe the answer is:

adders

(Other definitions for adders that I've seen before include "Do they deal with tots" , "Sadder with snakes" , "People doing sums" , "Totting 25 down?" , "Arithmetic snakes?" .)

I've seen this clue in The Times and The Sunday Times.
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