Crossword Genius

Echo sounder (5)

Ross

I believe the answer is:

sonar

'echo sounder' is the definition.
(synonyms)

This is all the clue.

(Other definitions for sonar that I've seen before include "Device for detecting objects used in arson" , "Underwater detection device" , "Locating device" , "Undersea sensing system" , "Detection system at sea" .)

I've seen this clue in the Sydney Morning Herald and The Telegraph.
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