Red Sea nation; capital Khartoum (5)
I believe the answer is:
sudan
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">red sea nation</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">capital khartoum</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that Sudan has the capital city Khartoum)</span><br/ ><br/ ></span>
(Other definitions for sudan that I've seen before include "Region of Africa" , "Us and the African state" , "Recently-split country" , "African country on the Red Sea" , "Country W. of Ethiopia" .)