Crossword Genius

Instrument to track distant objects (5)

Ross

I believe the answer is:

radar

'instrument to track distant objects' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for radar that I've seen before include "Range-finding apparatus" , "one sends out signals" , "It can locate things in the dark or fog" , "Range and direction finding equipment" , "Aircraft detection system" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.
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