Perhaps the young Mozart's expert crack at symphony's finale (7)

I believe the answer is:

prodigy

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'perhaps the young mozart's' is the definition.
I can't tell whether this definition defines the answer.

'expert crack at symphony's finale' is the wordplay.
'expert' becomes 'pro' (short for professional).
'crack at' becomes 'dig' (I can't justify this - if you can you should believe this answer much more).
'finale' suggests the final letters.
The last letter of 'symphony' is 'y'.
'pro'+'dig'+'y'='PRODIGY'

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(Other definitions for prodigy that I've seen before include "Amazingly talented child" , "Youngster of exceptional abilities" , "Amazing thing" , "Child genius" .)

I've seen this clue in The Guardian.

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