Related Clues:

• English informant
• Stool pigeon
• One who sings
• Stoolie (Brit. slang)
• British stoolie
• Snitcher
• One who sings but maybe shouldn't
• Informer, slangily (Var.)
• Informer (Sl.)
• Packed item that might fly away?
• Police informant
• Talker looking for a deal, often
• Singing pigeon
• Narc
• Singer of a sort