Crossword Genius

Reason to stop flying (6)

Ross

I believe the answer is:

ground

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

'reason' is the definition.
(I know that reason can be written as ground)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ground that I've seen before include "Powdered; land" , "what coffee might be" , "Terrain" , "Arena" , "crumbled" .)

I've seen this clue in The Globe and Mail.
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