Crossword Genius

The remaining six balls are not required (4,4)

Ross

I believe the answer is:

left over

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

'the remaining' is the definition.
(I've seen this before)

'six balls are not required' is the wordplay.
I cannot really understand how this works, but
'balls' could be 'over' (I've seen this in other clues) and 'over' is located in the answer.
The remaining letters 'left' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for left over that I've seen before include "Not used up" , "Spare, remaining" , "Surplus" .)

I've seen this clue in the Evening Standard.
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