Possible Clues:

• Spills the beans
• Mentions specific people
• Sings, in a way
• Punched by Mafia's leader, Irishman doubled up is an informer
• Emulates a rat
• Identifies those responsible as men, perverted celebrities
• Sings for grasses?
• Sings
• Sings, so to speak
• Succumbs to interrogation, perhaps