Related Clues:

• PC clicker
• *Mob hit victim
• Informer, slangily
• Prison canary?
• Field scurrier
• What clicks with small animal
• A mazing animal?
• Place to set a trap
• Laboratory testee
• Snitch or snitcher
• Trackpad alternative
• Traitor type
• Exterminator's target, sometimes
• Proverbially quiet rodent
• Alley rodent