Capital city of Mongolia (4,5)
I believe the answer is:
ulan bator
'capital city of mongolia' is the definition.
(I know that Mongolia has the capital city Ulan Bator)
This is all the clue.
(Other definitions for ulan bator that I've seen before include "Exotic capital" , "Mongol city" , "Capital of Mongolia" , "Mongolian capital" , "capital city" .)