Anklebone (5)
I believe the answer is:
talus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">anklebone</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for talus that I've seen before include "Ankle bone" , "Foot's part" , "Yarns" , "Ankle-bone" .)