Possible Clues:

• Prevent from seeing
• One-ended pen cover for pupils
• Unable to perceive pen after drinking bout
• Item worn to swing at a pinata
• Cover eyes, having difficulty accommodating student congregation
• Stop seeing brassy Swedish soprano following breaks
• 'Pin the tail on the donkey' prop
• Pin the Tail on the Donkey accessory
• Round back of skull, secure pen in headband
• Unable to see pen after drinking bout