Related Clues:

• Ozone layer, for one
• Gladiator gear
• Policeman's badge
• Bulwark
• Police officer's badge, e.g.
• Sword stopper, maybe
• Police officer's badge
• Arrow stopper, perhaps
• Squire's burden
• Police badge
• Defensive armor
• Protect or screen
• Protective structure or device
• Is held as protective device
• Protect or conceal