Informal discussion (4)

I believe the answer is:
chat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">informal discussion</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a chat is a casual conversation)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for chat that I've seen before include "Chew the fat" , "Talk amiably - bird" , "Bird - talk easily" , "tittle-tattle" , "Small songbird of the thrush family" .)