Reverberations (6)
I believe the answer is:
echoes
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reverberations</span>' is the definition.<br/ ><span class="explanation-format__explanation">('echo' can be a synonym of 'reverberation')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for echoes that I've seen before include "rings" , "Natural sound reflections" , "Returning sounds" , "Repetitions of sounds" , "Reflections of sound waves" .)