Crossword Genius

Up or down detector (5)

Ross

I believe the answer is:

radar

This clue is a double definition.

'up or down' is the first definition.

'detector' is the second definition.
(I've seen this before)

(Other definitions for radar that I've seen before include "Palindromic tracking system" , "Range and direction finding equipment" , "Technique using beam" , "Radio detection system" , "Aircraft detection system" .)

I've seen this clue in The Guardian.
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