Ancient kingdom on the Nile (5)
I believe the answer is:
nubia
'ancient kingdom on the nile' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nubia that I've seen before include "Region of northeast Africa" , "Ancient region of Sudan and southern Egypt" , "Ancient African region absorbed into southern Egypt" , "Old African state" , "Ancient kingdom" .)