Related Clues:

• Struck stuff
• Work in a gallery
• __ drum
• Crude in a gusher
• OPEC product
• Wildcatter's strike
• "There Will Be Blood" focus
• Refinery flow
• Biggest export of 99-Down
• The Da Vinci coat?
• Kind of slick
• Canadian resource
• Source of Rockefeller's wealth
• Gusher flow
• Slick material