Possible Clues:

• Object of cocker (?) to thwart at the 20
• Table game with balls and cue
• Where black and blue are colours and red and white are not
• Stymie on the green?
• In Peterborough there's no right for BG
• Game fish associated with East River
• In which a rest may be required during a break?
• Game with 22 balls
• If laid on the table, one may need to use a cushion
• Game for raw cadet to take a cue?