Ancient Nile kingdom (5)
I believe the answer is:
nubia
'ancient nile kingdom' 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 "Ancient region of Africa" , "Upper 16 Across region" , "Ancient African country in Egypt and Sudan" , "Ancient region of Sudan and southern Egypt" , "Ancient African region absorbed into southern Egypt" .)