Possible Clues:

• A game for dodgers?
• Organised crime, being bats
• Serving needs
• It would not be honest to have them at court, by the sound of them
• Game making supporters lose their head?
• Game - noises
• Rows or dishonesty
• By the sound of it, the dishonesty of the court
• Unscrupulous schemes to make money from game
• Tennis paddles