European ordered vital article (7)
I believe the answer is:
latvian
'european' is the definition.
(someone from Latvia)
'ordered vital article' is the wordplay.
'ordered' is an anagram indicator.
'article' becomes 'an' (English indefinite article).
'vital' anagrammed gives 'latvi'.
'latvi'+'an'='LATVIAN'
(Other definitions for latvian that I've seen before include "Eg, native of Riga" , "Riga resident" , "One from Riga" , "republican" , "like rider on tiger" .)