Crossword Genius

Conductor and what he shook when much younger? (6)

Ross

I believe the answer is:

rattle

'conductor' is the definition.
(Rattle is an orchestra conductor)

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

(Other definitions for rattle that I've seen before include "Clink; disconcert" , "Baby's toy - racket - disconcert" , "Child's noisy toy" , "American viper" , "Toy for child and football fan" .)

I've seen this clue in The Guardian.
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