Possible Clues:

• It is inevitable, as Williams's play reminded
• At the end of the day, Asimov produced it
• New fanlight provides light at the front when it starts to get dark
• First of Franciscans approaching giant screens, when vespers observed?
• Thing amazingly preceding Californian autumn sunset
• When evening begins, declared champion goes over defeat
• Man decapitated before autumn, when it gets dark
• What to say at bedtime about following evening
• Dusk near, female given shelter by giant
• Glint half put out resulting in darkness