Possible Clues:

• It's wicked in the dark
• Toddler's monster deterrent
• Device for one who's afraid of the dark
• Sir heard losing the head with dilemma illuminating aspects of The Dark
• What enables one to see and hear horseman land
• It supposedly keeps the monster inside the closet
• Man on board reportedly not heavy -- a wicked type in the dark?
• Nursery glower
• Bogeyman deterrent, so it's said
• Nursery glow