Related Clues:

• Underground tunneler
• Suburban tunneler
• Burrowing insectivore
• Skin mark
• Burrowing creature
• Burrowing animal
• Slapstick trio member
• 20-Across, 38-Across or 55-Across
• Unwelcome C.I.A. discovery
• Marilyn Monroe mark
• Beauty spot
• Source of a leak, perhaps
• Insectivorous mammal
• Source of a leak
• Embedded spy