Neighbor of Nigeria (4)
I believe the answer is:
chad
'neighbor of nigeria' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for chad that I've seen before include "West African country" , "African republic; punched bits" , "African country south of Libya" , "Small piece that's removed when a hole is punched, in a card say" , "foreign land" .)