New Tory visit embraces upper-class flair (10)
I believe the answer is:
virtuosity
'flair' is the definition.
(thesaurus)
'new tory visit embraces upper-class' is the wordplay.
'new' indicates an anagram.
'embraces' is an insertion indicator.
'upper-class' becomes 'u' (similar in meaning).
'tory'+'visit'='toryvisit'
'toryvisit' anagrammed gives 'virtosity'.
'virtosity' enclosing 'u' is 'VIRTUOSITY'.
(Other definitions for virtuosity that I've seen before include "Mastery - artistry" , "Great performing skill" , "Technical skill" .)