High mountain (3)
I believe the answer is:
alp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">high mountain</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 alp that I've seen before include "One of a European mountain range" , "High mountain" , "Mont Blanc, for example" , "Swiss mountain" , "high point" .)