Related Clues:
- Tunneling critter
- Spy also called a "sleeper agent"
- Spot troublesome animal in garden?
- MI6 concern
- Poor golfer perhaps that still gets down the hole
- Target of an exterminator's smoke bomb
- Novice player's rare and rather absorbing book
- Buddy of 18-Across
- Roger or Peter
- Tunnel excavator
- Facial mark
- Skin imperfection
- Beauty mark or burrowing animal
- Tunnel-creating creature
- Blind burrower