Possible Clues:

• William -, (Jerusalem)
• William - - , visionary
• 3's creator born 23, perhaps
• William —, English poet/visionary
• Ragtime's Eubie
• Poet who wrote 48-Across
• British poet/painter
• ''The Pink Panther'' director Edwards
• Painter using black and red
• William -, English poet, artist and visionary