Audio effect (4)
I believe the answer is:
echo
'audio effect' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for echo that I've seen before include "Nymph whose love Narcissus spurned" , "She loved Narcissus - it's recalled" , "A natural sound reflection" , "Reverberate - nymph spurned by Narcissus" , "Mimic" .)