Twitter (7)
I believe the answer is:
chirrup
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">twitter</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for chirrup that I've seen before include "Sound made by a bird" , "Tweet" , "Bird's sound" , "Twitter" , "Bird's noise" .)