Muffled (5)
I believe the answer is:
muted
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">muffled</span>' is the definition.<br/ ><span class="explanation-format__explanation">('mute' can be a synonym of 'muffle')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for muted that I've seen before include "fitted with silencer" , "Faint" , "Not loud" , "Soft-pedalled" , "Muffled, subdued" .)