Related Clues:

• Mouse's big cousin
• Unpopular singer
• Narc
• Rizzo the Muppet, notably
• Be a squealer
• Oft-smelled rodent?
• Ben in "Ben"
• __ race
• "The Wind in the Willows" critter
• One down in the dumps?
• Certain stowaway
• Turn state's evidence, maybe
• Male meower
• One who squeals
• "Was it a ___?" "Yeah, a great big one" (line from "L.A. Confidential")