Talk, chatter (3)
I believe the answer is:
jaw
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">talk</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(jawing is a kind of talking)</span><br/ ><br/ >'<span class="explanation-format__original">chatter</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for jaw that I've seen before include "Facial bone" , "Natter - mandible" , "Talk incessantly" , "Chat" , "Part of the head" .)