Crossword Genius

Navigating aid looks both ways (5)

Ross

I believe the answer is:

radar

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'both ways' is the definition.

I don't understand the rest of the clue.

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(Other definitions for radar that I've seen before include "Navigation aid" , "Technique using beam" , "Measuring device that locates distant objects" , "Position detector using radio wave pulses" , "Locator of plane" .)

I've seen this clue in The Mirror.
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