Crossword Genius

Locator of plane going east or west (5)

Ross

I believe the answer is:

radar

I'm a little stuck... Click here to teach me more about this clue!

'locator of plane' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for radar that I've seen before include "Technique using beam" , "System for locating distant objects" , "waves to expose foe" , "Navigational aid" , "Electronic tracker" .)

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