Crossword Genius

Something shaky, we hear (6)

Ross

I believe the answer is:

rattle

I'm a little stuck... Click here to teach me more about this clue!

'hear' is the definition.
The answer and definition can be both to do with perception as well as being verbs in their base form.
Maybe you can see a link between them that I can't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for rattle that I've seen before include "Child's noisy toy" , "Baby's toy; sound of loose part" , "Unnerve - baby's plaything" , "Lively old song - Shake, . . . . . . and roll" , "Disconcert - conductor, Simon" .)

I've seen this clue in the Evening Standard.
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