Crossword Genius

Submarine detector (5)

Ross

I believe the answer is:

sonar

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

This is the entire clue.

(Other definitions for sonar that I've seen before include "Sub's navigation" , "Underwater detection system" , "Method of echolocation" , "echo device" , "Underwater detector" .)

I've seen this clue in the Newsday and the Universal.
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