Related Clues:

• Kind of slick
• Canadian resource
• Source of Rockefeller's wealth
• Gusher flow
• Slick material
• Many a MoMA piece
• Upton Sinclair novel
• Rockefeller's biz
• ''Crude'' fuel
• Product of a field of dreams?
• Gallery hanging
• Spill stuff
• Business for Shell or ExxonMobil
• Manet's "The Luncheon on the Grass," e.g.
• Covering for some wrestlers