Sleeper's sound (5)
I believe the answer is:
snore
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sleeper's sound</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for snore that I've seen before include "Sound made by sleeper" , "6 made by sleeper" , "Grunting sound" , "Breathe noisily during sleep" , "Make raucous nasal sound during sleep" .)