Possible Clues:

• Treatment by hand
• A grand, silly time for the rubber
• The era of the common people? There's the rub
• Mum’s guru gives hands-on treatment
• Remove knots from, maybe
• The whole time, standard in golf gets to threaten manipulative establishment?
• Whirlpool alternative
• Trainer's treatment
• That's how old the mob is - that's the rub
• It can get the knots out