Related Clues:

• Moles, maybe
• Buries, as bulbs
• Tunnelers
• Herbs and vegetables
• Moles, for example
• Smiley's people
• 007 and 99
• Seekers of intelligence?
• Beauty marks, often
• Secretly watches
• Intelligence operatives
• Some spies
• Burrowing animals
• Some enemies of the state
• M's men