Crossword Genius

You're busy removing uneven balls (4)

Ross

I believe the answer is:

orbs

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

'balls' is the definition.
(I know this)

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

Can you help me to learn more?

(Other definitions for orbs that I've seen before include "Poetic eyes, bros" , "Round objects" , "Ball shapes" , "Eyeballs" , "Spherical shapes" .)

I've seen this clue in the Sydney Morning Herald.
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