Crossword Genius

"HELLO . . . Hello . . . hello . . ." effect (4)

Ross

I believe the answer is:

echo

(Other definitions for echo that I've seen before include "Comms code word for E" , "The distant sound" , "repeated answer" , "Marked by heat" , "Nymph whose love Narcissus spurned" .)

I've seen this clue in The New York Times.
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