Related Clues:

• It may be scratched?
• Round one used with cannon shot
• Object to pot boiler, say, about a badly brought up bouncer
• It can be pocketed
• One's made to move on cue
• One made to move on cue
• Sphere to be pocketed?
• This could be part of a plant, or potted
• Thing you'll see in a pool hall (2 words)