It sounds shaky (6)

I believe the answer is:

rattle

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'it sounds shaky' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for rattle that I've seen before include "Baby's toy; irritate" , "rabbit" , "Child's noisy toy" , "Make worried, baby's toy" , "Baby's toy - conductor" .)

I've seen this clue in the Evening Standard.

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