European nations upset after vote, ultimately (8)
I believe the answer is:
estonian
'european' is the definition.
(person from Estonia)
'nations upset after vote ultimately' is the wordplay.
'upset' is an anagram indicator.
'after' means one lot of letters go next to another.
'ultimately' suggests the final letters.
The last letter of 'vote' is 'e'.
'nations' anagrammed gives 'stonian'.
'stonian' after 'e' is 'ESTONIAN'.
(Other definitions for estonian that I've seen before include "One from Tallinn" , "Eg, native of Tallinn" , "Baltic state national" , "One from a Baltic state" , "Baltic state native" .)