Possible Clues:

• Day's end, poetically
• Gwendolyn Brooks poem that begins 'When the sun sinks behind the mountains'
• Happening I'd note, arriving at close of day
• Water moving smoothly in latter part of day?
• When a vesper bell rings
• Old term for evening
• Regular and predictable movement late in the day
• Contest the writer would finally leave: it’s late in the day
• A tranche of credit never used up, at the end of the day
• Shelley's time opening cards amid cheers essentially