Crossword Genius

Sounds like a baby’s toy (7)

Ross

I believe the answer is:

rattles

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'sounds' is the definition.
(rattle is a kind of sound)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

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

I've seen this clue in The Mirror.
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