Republic and river of West Africa (5)

I believe the answer is:

niger

(Other definitions for niger that I've seen before include "Country in interior of N Africa, capital Niarney" , "Country W. of Chad" , "Land-locked country and river of W Africa" , "African country dominated by the Sahara, until 1969 a French colony" , "Landlocked W African republic" .)

I've seen this clue in The Sun.

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