High hill (3)
I believe the answer is:
tor
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">high hill</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 tor that I've seen before include "Pillar of rock" , "Rocky height, eg Mam" , "Dartmoor peak" , "rise" , "Hill or rocky peak" .)