Alaskan river (5)
I believe the answer is:
yukon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">alaskan 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 yukon that I've seen before include "Klondike region of Canada" , "Canadian territory, famed for the 1897 gold rush" , "North American banker" , "River in northern Canada" , "NW Canadian territory" .)