Crossword Genius

Submarine device (5)

Ross

I believe the answer is:

sonar

'submarine device' 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 "Underwater detector" , "Underwater navigation device" , "Underwater location equipment" , "location device" , "Echo-sounding equipment" .)

I've seen this clue in the Universal, the Penny Press, the New York Times and the King Feature Syndicate.
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