Neighbor of Mauritania (4)
I believe the answer is:
mali
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">neighbor of mauritania</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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" .)