Capital on the Nile (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">capital on the nile</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cairo that I've seen before include "Port upstream from the Nile delta" , "African city" , "North African capital" , "Egypt's capital" , "Capital city on the Nile" .)