Nymph spurned by Narcissus (4)
I believe the answer is:
echo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nymph spurned by narcissus</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for echo that I've seen before include "Mythical nymph" , "one catches on the rebound?" , "Sound following" , "'Greek nymph, she pined away until only her voice remained (4)'" , "Audio effect" .)