Related Clues:

• Do surveillance on
• Follow furtively
• Follow stealthily
• Donkey attachment
• Fox follower
• Caboose, e.g.
• Manx lack
• Lobster serving
• Keep tabs on
• Kohoutek feature
• Kite attachment
• Kite stabilizer
• Bird part
• Investigator, at times
• Part of 10-Across