Related Clues:

• Alley dweller
• Disloyal one
• Snitch, slangily
• Dirty double-crosser
• Mouse relative
• Squeal on your sidekicks
• Word in a Cagney impersonation
• Chinese zodiac animal
• Experiment subject
• Word before or after ''pack''
• Piper follower
• Obnoxious sort
• Treachery metaphor with a distinctive odor?
• Rodent
• Pet rodent