Outskirts of Russia invaded by Arab country (7)
I believe the answer is:
romania
'country' is the definition.
(Romania is an example)
'outskirts of russia invaded by arab' is the wordplay.
'outskirts of' says to hollow out the word (remove centre letters).
'invaded by' means one lot of letters goes inside another.
'arab' becomes 'omani' (Omani is an example).
'russia' with its middle taken out is 'ra'.
'ra' enclosing 'omani' is 'ROMANIA'.
(Other definitions for romania that I've seen before include "Country in SE Europe" , "European republic" , "East European country" , "Country of eastern Europe" , "Bucharest is its capital" .)