Herzegovina's partner (6)
I believe the answer is:
bosnia
'herzegovina's partner' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bosnia that I've seen before include "Southeast European country (shortened form)" , "European nation" , "No bias (anag)" , "Balkan region joined with Herzegovina" , "European country, capital Sarajevo" .)