South American mountains (5)
I believe the answer is:
andes
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">south american mountains</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 andes that I've seen before include "Peak District" , "World's longest mountain range" , "Danes seen in mountains" , "danes found in mountains" , "South American mountain chain" .)