Possible Clues:

• It's white with no number
• Snooker sphere
• Line up, as you might say, black — everything that's needed to hit it?
• Snooker need
• Yell after a series of waiters — out loud — to bring the white
• As they say, dice completely white?
• What helps actor to speak and dance — part of a colourful game
• Signal to start dancing that's needed during break
• The white
• White roller in billiards