Possible Clues:

• Lovely new party game
• Sport that involves the moves that start the answers to starred clues
• Game spoiled lovely social function
• Setter's activity
• What an Olympic athlete may spike
• Sport hinted at by the ends of 17-, 24-, 36- and 47-Across
• Sport whose jargon includes the first words of 17-, 23- and 48-Across
• Piece of sports equipment that's spiked
• Shower before party game
• Olympics event played with a net