Related Clues:

• Attacker
• Uninvited guest
• Unwelcome visitor
• Intruder
• Raid participant
• Occupying force
• Martian, in some sci-fi
• Saxon or Celt, once
• Trespasser
• One enters by force to conquer
• Proud to have lost his collar?
• Can't have been so proud without a crown
• Raider
• See 17
• A driven out intruder