Peak in the "Odyssey" (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">peak in the odyssey</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ossa that I've seen before include "Legendary mountain" , "So as to become a Greek mountain" , "Hard things" , "So as to turn to bones" , "To pile Pelion upon - is to make even greater" .)