Crossword Genius

Don’t start to draw breath at snake (3)

Ross

I believe the answer is:

asp

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for asp that I've seen before include "Cleopatra's poisoner" , "creeper" , "Cold-blooded killer" , "Small poisonous snake" , "Cleopatra-killing snake" .)

I've seen this clue in The Mirror.
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