Related Clues:

• ABC's ''The ___''
• Hill-building beast
• Uninvited rooter
• Marilyn's mark
• Spy plant
• Pesky yard critter
• Birthmark
• Type of spy
• Tunnel creator
• Marilyn's facial feature
• Spy spying on spies
• Underground burrower
• A spy within an organisation
• Small pigmented spot
• Furry burrowing animal