Related Clues:

• Nightfall
• What some are afraid of
• Like most Broadway theaters on Monday
• Time of day
• Dusk
• What nyctophobes fear
• Like a moonless night
• Not currently in use, as a theater
• Murky
• Not illuminated
• Up at night, as owls
• Sombre
• With 28-Across, a Hogwarts class
• Lacking light
• Cave feature