African river or country (5)
I believe the answer is:
niger
I believe this is a double definition.
'african river' is the first definition.
(I've seen this before)
'country' is the second definition.
(African country)
(Other definitions for niger that I've seen before include "Land-locked country and river of W Africa" , "22 across (anag) -- northwest African river" , "Landlocked W African republic" , "West African republic" , "Country W. of Chad" .)