Crossword Genius

Empty hallway sound (4)

Ross

I believe the answer is:

echo

'empty hallway sound' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for echo that I've seen before include "Return of sound waves" , "Response" , "call back" , "Send back" , "Repeated sound" .)

I've seen this clue in the LA Times.
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