Virtuosity (7)

I believe the answer is:

mastery

'virtuosity' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for mastery that I've seen before include "superior knowledge" , "Total control" , "Comprehensive skill" , "Control - supreme skill" , "Supremacy" .)

I've seen this clue in the LA Times, The Guardian, The Telegraph and the Newsday.com.

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