Possible Clues:

• The ___ on the Shelf [S]
• Polar toy maker
• Fairy-tale night worker
• "A Midsummer Night's Dream" extra
• Santa, in Moore's poem
• Capricious creature
• "The best way to spread Christmas cheer is singing loud for all to hear" film
• Creature of folk tales
• Mischievous creature
• Trickster