Crossword Genius

Shakes audibly and chatters, not quietly (7)

Ross

I believe the answer is:

rattles

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'shakes' is the definition.
(rattling is a kind of shaking)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for rattles that I've seen before include "Noisy toys for babies" , "Starlet (anag)" .)

I've seen this clue in The Times.
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