Crossword Genius

Sub tracker (5)

Ross

I believe the answer is:

sonar

'sub tracker' 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 location equipment" , "System for locating underwater objects" , "Locating device" , "Underwater detector" , "Device for detecting objects under water with sound waves" .)

I've seen this clue in the King Feature Syndicate and The Telegraph.
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