Related Clues:

• Sombre
• Lower, as headlights
• Lower, as the lights
• Dusky
• With 28-Across, a Hogwarts class
• Lower, as lights
• Sunset
• Badly lit
• Not very likely
• Badly illuminated
• Needing light
• Unlikely to happen
• With 54-Across, black magic
• Switch to low beams
• The ''good'' chocolate