Sound like a bird (5)
I believe the answer is:
cheep
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sound like a bird</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cheep that I've seen before include "Weak cry of young bird" , "Bird noise" , "Young bird's cry" , "High-pitched sound" , "Make contribution to Twitter" .)