Country that has converted vital article (6)
I believe the answer is:
latvia
'country' is the definition.
(Latvia is a European country)
'converted vital article' is the wordplay.
'converted' indicates anagramming the letters.
'article' becomes 'a' (the indefinite article in English).
'vital' with letters rearranged gives 'latvi'.
'latvi'+'a'='LATVIA'
'that has' acts as a link.
(Other definitions for latvia that I've seen before include "Baltic state, capital Riga." , "Baltic republic" , "Northeast European country" , "European republic, capital Riga" , "Baltic country" .)