Crossword Genius

Speed detector (5)

Ross

I believe the answer is:

radar

'speed detector' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for radar that I've seen before include "System for detecting objects with radio waves" , "Equipment for locating objects" , "Radio detection system" , "waves to expose foe" , "location finder" .)

I've seen this clue in the Penny Press.
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