Try-out VII’s turning out to show artistry (10)
I believe the answer is:
virtuosity
'artistry' is the definition.
(thesaurus)
'try-out vii's turning out' is the wordplay.
'turning out' is an anagram indicator.
'try'+'out'+'viis'='tryoutviis'
'tryoutviis' anagrammed gives 'VIRTUOSITY'.
'to show' is the link.
(Other definitions for virtuosity that I've seen before include "Mastery - artistry" , "Technical skill" , "Great performing skill" .)