Custer's last stand (6,7)
I believe the answer is:
little bighorn
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">custer's last stand</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for little bighorn that I've seen before include "native American success" , "Scene of Custer's Last Stand, 1876" , "Site of Custer's defeat" , "Custer's final battle" .)