Crossword Genius

Method of echolocation (5)

Ross

I believe the answer is:

sonar

'method of echolocation' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for sonar that I've seen before include "Underwater detection system" , "Echo-sounding device" , "Detection system at sea" , "Method of echolocation" , "Undersea sensing system" .)

I've seen this clue in The Times and The Independent.
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