Related Clues:

• Name names
• Lab critter
• Mob pariah
• Double-crosser
• Arnold or Judas, e.g.
• Lowlife snitch
• Nogoodnik
• Squeal (on)
• Act the fink
• Scoun-drel
• 'You dirty --!'
• Stool pigeon
• One who sings
• Wharf pest
• This isn't true