Confab (4)

I believe the answer is:
chat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">confab</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for chat that I've seen before include "Exchange text or voice messages through a computer" , "Inconsequential conversation" , "Natter" , "Talk informally; bird" , "Rabbit" .)