Related Clues:

• Pro ___ (acting)
• Sonny who sang 'Laugh at Me'
• Rock star turned activist
• Sonny or Chastity
• Songwriter Sonny
• U2 lead singer
• U2 singer
• President pro ___
• Pro ___ (like some legal work)
• Pro ___ (for now)
• See 59-Down
• -- -tat-tat
• Rock singer in social causes
• With 59-Across, a knock
• 'With or Without You' lyricist