Related Clues:

• Crabgrass, e.g.
• Marijuana, slangily
• Spray target, perhaps
• 007, e.g.
• Keep tabs (on)
• Herbicide target
• Gardener's nemesis
• CIA worker
• Lawn invader
• Observe furtively
• Mole or plant
• Plant, perhaps
• Seek intelligence, in a way
• James Bond, for one
• Dispensary stock