Talkative person (10)
I believe the answer is:
chatterbox
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">talkative person</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for chatterbox that I've seen before include "one who talks a lot" , "Babbler" , "who goes on and on?" , "There's much talk from me" , "Gasbag" .)