Crossword Genius

Reverb effect (4)

Ross

I believe the answer is:

echo

(Other definitions for echo that I've seen before include "Greek girl in love with Narcissus" , "Repetition by reflection" , "call back" , "'Greek nymph, she pined away until only her voice remained (4)'" , "Let's hear it again for the Greek nymph who loved Narcissus in vain" .)

I've seen this clue in The Wall Street Journal.
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