Crossword Genius

Sub's tracking device (5)

Ross

I believe the answer is:

sonar

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sub's tracking device</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for sonar that I've seen before include "Underwater detection device" , "Device for detecting objects used in arson" , "echo device" , "Method of echolocation" , "Underwater navigation device" .)

I've seen this clue in the Newsday.
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