Crossword Genius

Noise that will tell you there's a baby about (6)

Ross

I believe the answer is:

rattle

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'noise' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for rattle that I've seen before include "worry" , "making one upset" , "Baby's toy; sound of loose part" , "Gurgling sound in throat" , "cause nervousness" .)

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