Possible Clues:

• Conceptual artist put tea in ditch
• Modern artist -- in Berlin, you will get Munch
• Marcel --, painter of 'Nude Descending a Staircase, No. 2'
• Marcel —, French artist
• 'Nude Descending a Staircase' painter
• Artist and chess player who said 'While all artists are not chess players, all chess players are artists'
• Artist offers tea: drop round
• Artist Marcel
• Marcel —, French artist
• Artist from Duke University, title-holder