Niamey's nation (5)
I believe the answer is:
niger
'niamey's nation' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for niger that I've seen before include "Country W. of Chad" , "West African river and country" , "22 across (anag) -- northwest African river" , "Part of Africa" , "The black" .)