Capital of Sudan (8)
I believe the answer is:
khartoum
'capital of sudan' is the definition.
(synonyms)
This is all the clue.
(Other definitions for khartoum that I've seen before include "General Gordon died at the siege of this African city" , "African capital" , "'Gordon woz 'ere'" , "Nile location" , "City at the confluence of the Blue and White Nile" .)