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Eccentrics when potting Red, Green, Blue and Black? (8)

Ross

I believe the answer is:

oddballs

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

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

Can you help me to learn more?

(Other definitions for oddballs that I've seen before include "Weirdos" , "Bold lads? (anag)" , "Strange or eccentric people" , "making up half the FA Cup draw?" , "nuts" .)

I've seen this clue in The Independent.
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