Musical sort of party, nothing else (8)

I believe the answer is:

concerto

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'party nothing else' is the definition.
I can't tell whether this defines the answer.

'musical sort of' is the wordplay.
'musical sort' becomes 'concert' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'of' becomes 'o'.
'concert'+'o'='CONCERTO'

Can you help me to learn more?

(Other definitions for concerto that I've seen before include "Orchestral work for solo instrument" , "piece of music" , "Musical work" , "10 [COMPOSITION]" , "Work for orchestra and soloist(s)" .)

I've seen this clue in the Evening Standard.

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