Worry classical conductor (6)

I believe the answer is:

rattle

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This clue could be a double definition.

'worry' is the first definition.
(I've seen this before)

'classical conductor' is the second definition.
'rattle' can be an answer for 'conductor' (Rattle is an orchestra conductor). I am unsure of the 'classical' bit.

Can you help me to learn more?

(Other definitions for rattle that I've seen before include "Clatter or bang" , "Shake - baby's toy" , "not to compose" , "Venomous creature's warning" , "Make someone nervous or anxious" .)

I've seen this clue in The Sun.

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