Kneecap (7)
I believe the answer is:
patella
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kneecap</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for patella that I've seen before include "Knee bone" , "Joint cover" , "positioned on each knee" , "bit of body usually under trousers!" , "A pallet (anag.)" .)