Crossword Genius

Underwater detection system (5)

Ross

I believe the answer is:

sonar

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">underwater detection system</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for sonar that I've seen before include "Locating device" , "location device" , "Undersea sensing system" , "System for locating underwater objects" , "Echo-location system" .)

I've seen this clue in the USA Today, The Times, the Evening Standard and the Sydney Morning Herald.
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