White ball in snooker or pool (3,4)

I think it could be either:

Which length description are you looking for?:

3,4

cue ball

(Other definitions for cue ball that I've seen before include "Object struck by a snooker player" , "Jimmy White's white?" , "The white in snooker" , "Feature of pub entertainment" .)

I've seen this clue in The Mirror.

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