Possible Clues:

• Surrealist painter with an iconic mustache
• "The Persistence of Memory" artist
• Bunuel collaborator
• Arp contemporary
• Big name in surrealism
• Limp-watch artist
• Mustachioed Spanish painter
• 'Swans Reflecting Elephants' artist
• Flamboyant Spanish surrealist
• Painter of melting pocket watches