Unnerve the snake? (6)

I believe the answer is:

rattle

(Other definitions for rattle that I've seen before include "led to Tweedledum and Tweedledees quarrel?" , "Toy for baby or football fan" , "Warning given by deadly snake" , "Infant's toy" , "Vibrate noisily" .)

I've seen this clue in The Irish Times.

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