One that scares a snake (7)

I believe the answer is:

rattler

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

I can't explain the remainder of the clue.

(Other definitions for rattler that I've seen before include "North American pit viper" , "US snake (colloq.)" , "remarkably good specimen" , "Nickname for US snake with horny segments in its tail" , "(it crawls?)" .)

I've seen this clue in The Hindu.

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