Cricket sound (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cricket sound</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 chirp that I've seen before include "Tweet" , "Sound made by small bird" , "Twitter" , "Short sharp tone of grasshopper" , "Fledgling's sound" .)
(Another definition for chirr that I've seen is " trill".)