Crossword Genius

Upright, not upper class, old expert musician (8)

Ross

I believe the answer is:

virtuoso

'expert musician' is the definition.

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

(Other definitions for virtuoso that I've seen before include "Musician with exceptional technique" , "Showing dazzling skill" , "Highly skilled musician" , "Person who excels in techniques of singing or playing music" , "maestro?" .)

I've seen this clue in The Times.
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