Crossword Genius

The world's longest river (4)

Ross

I believe the answer is:

nile

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the world's longest river</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 eastern Africa" , "Long river" , "African river" , "Cairo's river" , "long-distance runner in Africa" .)

I've seen this clue in The Independent.
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