Crossword Genius

Run to avoid large snake (5)

Ross

I believe the answer is:

adder

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'snake' is the definition.
(adder is a kind of snake)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for adder that I've seen before include "1 of 21 [SNAKES]" , "An arithmetic snake" , "calculator?" , "Dread (anag)" , "Something you have to reckon with" .)

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