Nymph spurned by Narcissus (4)
I believe the answer is:
echo
'nymph spurned by narcissus' is the definition.
(I've seen this before)
This is all the clue.
(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" .)