Possible Clues:

• Discipline playing matches in set
• Tests machine for adjustment correction
• One's wearing simple pieces, time for dressing down?
• Severe reprimand is similar to 19 down on Worker's Square
• Beating faulty machine tests
• Mate snitches, possibly resulting in a beating
• Old fashioned discipline has upset model -- stick being brought round!
• It is given to correct the mess I can't put right
• Endless speed is opening setter up for reprimand
• Beating in matches with set play