Crossword Genius

Fluster half of venomous reptiles (6)

Ross

I believe the answer is:

rattle

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'fluster' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for rattle that I've seen before include "Vibrate noisily" , "flap" , "led to Tweedledum and Tweedledees quarrel?" , "Toy for baby or football fan" , "Clatter or bang" .)

I've seen this clue in The Independent.
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