Related Clues:

• Keep under surveillance
• Watch in secret
• Watch from hiding
• Watch sneakily over
• Sunday: start to prune that old stalk
• Secretly watch son with wild pony
• Secretly watch lad absorbing Playboy cover to cover?
• Bug, say
• Shadow, e.g
• Tail, perhaps
• Bug, e.g
• Observe with a nanny cam, say
• Watch using bugs
• Tail, e.g
• Watch unseen