Crossword Genius

On which one is airborne (4)

Ross

I believe the answer is:

over

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'on' is the definition.
(over can mean on top of)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for over that I've seen before include "In the sky?" , "Excessive" , "superior position" , "Accomplished" , "The delivery is concluded" .)

I've seen this clue in The Irish News.
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