Crossword Genius

Detection system (5)

Ross

I think it could be either:

radar

sonar

'detection system' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for radar that I've seen before include "System that detects and locates distant objects" , "Pulsed location-finder" , "beams" , "A help in locating" , "Locator of plane" .)

I've seen this clue in The Times, the Penny Press, the Evening Standard and The Telegraph.
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