Neighbor of Mauritania (4)
I believe the answer is:
mali
'neighbor of mauritania' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mali that I've seen before include "Timbuktu is in this landlocked country" , "Land" , "African country, once French Sudan" , "West African country, capital Bamako" , "Send mail out to Africa" .)