Strangely, one isn't a European (8)
I believe the answer is:
estonian
'european' is the definition.
(person from Estonia)
'strangely one isn't a' is the wordplay.
'strangely' indicates anagramming the letters.
'one'+'isnt'+'a'='oneisnta'
'oneisnta' is an anagram of 'ESTONIAN'.
(Other definitions for estonian that I've seen before include "Native of a Baltic republic" , "Native of Tallinn, say" , "Balt" , "Eastern Europe" , "From Tallinn, for example" .)