Possible Clues:

• Beatle bride's first name
• Famous Beatle bride
• 'Oh ___!' (song from the 'Imagine' album
• John's lady
• John's partner
• Half of a famous bed-in
• Artsy renaissance woman Ono
• "Oh __!": song on the album "Imagine"
• John Lennon song 'Dear ___'
• Sean Lennon's mother