Crossword Genius

A verbal comeback (4)

Ross

I believe the answer is:

echo

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'comeback' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for echo that I've seen before include "Reflected sound" , "Sound returning some moments later" , "Languishing nymph" , "repetitive" , "Rebounding sound" .)

I've seen this clue in The Globe and Mail.
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