Longest river in Africa (4)
I believe the answer is:
nile
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">longest river in africa</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 nile that I've seen before include "River of Egypt" , "Current" , "Cleopatra's river" , "Take a line to the river" , "River at Luxor" .)