Possible Clues:

• Driver's break
• Time taken in motor racing to fit a 3, for instance
• Pause that refreshes
• Halt for racing car
• Sinks ball, with end of cue back in brief service
• Pockets gratuity picked up in period of service?
• Trophies end up with fastest team here
• Indy service break
• Part of race in which mine's best?
• Break for driver in worst possible place on summit