Possible Clues:

• One who keeps late hours
• Person and creature of the dark
• Person often up in the wee hours
• Late party-goer provides own light
• Later, he's active close to outskirts of Whitehall
• Far from early bird close to waking — late starts
• Early bird's opposite?
• One unused to early retirement?
• 1979 album by Gerry Rafferty
• One who doesn't retire early