Possible Clues:

• Artist in comeback managed act with lion
• One badly taken in by fat old Italian painter
• Painter has a long time in the Fat Duck
• DiCaprio who played half of 67-Down
• 'Vitruvian Man' artist
• No ordeal can upset this genius
• Painter's sign crossing over a road
• Recalled artist at Christmas party being a famous painter
• 'Virgin of the Rocks' painter
• Bacon not quite admitting age, as old artist