European country upsetting Iranian (9)
I believe the answer is:
ukrainian
'european' is the definition.
(I've seen this before)
'country upsetting iranian' is the wordplay.
'country' becomes 'UK' (United Kingdom).
'upsetting' indicates anagramming the letters.
'iranian' is an anagram of 'rainian'.
'uk'+'rainian'='UKRAINIAN'
(Other definitions for ukrainian that I've seen before include "From Kiev, say?" , "East European" , "Slav" , "Balaclava fellow" , "from Chernobyl" .)