Related Clues:

• Double-dealer
• Jailhouse singer?
• "The Wind in the Willows" fellow
• Lab animal
• Betrayer
• Blow the whistle (on)
• Ben, in a film
• Name names
• Lab critter
• Mob pariah
• Double-crosser
• Lowlife snitch
• Nogoodnik
• Squeal (on)
• Act the fink