Canyon rebound (4)
I believe the answer is:
echo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">canyon rebound</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 echo that I've seen before include "In The Maid of the Mountains" , "Repeated sound" , "What evokes memories" , "Greek girl in love with Narcissus" , "Sound returning some moments later" .)