Greek peak
I believe the answer is:
ossa
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">greek peak</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 ossa that I've seen before include "Hard things" , "To heap Pelion on -- is to compound difficulties" , "Greek mountains" , "Legendary mountain" , "So as to turn to bones" .)