Jabbered (9)
(Another definition for chattered that I've seen is " Talked quickly about trivia - like magpie?".)
'jabbered' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for yapped that I've seen before include "Yelped" , "Barked like a small dog" , "Chatted" .)