Crossword Genius

Roulette ball limits circular movement (4)

Ross

I believe the answer is:

roll

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

'movement' is the definition.
(roll is a kind of movement)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for roll that I've seen before include "See 7" , "Cylinder (of paper etc)" , "Go over and over" , "Rob while sleeping < to pass" , "See 19" .)

I've seen this clue in the Irish Times.
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