Its capital is Belgrade (6)
I believe the answer is:
serbia
'its capital is belgrade' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for serbia that I've seen before include "Rabies in former Yugoslavia" , "Belgrade's country" , "Raise B in Yugoslavia" , "European republic, capital Belgrade" , "European country (bordering on 1 across)" .)