Related Clues:

• Van Gogh's ''Irises,'' e.g.
• Sunflower, for one
• Lube
• Paint base, sometimes
• Farmer's purchase
• 'Black gold'
• 3-IN-ONE, e.g.
• Parakeet treat
• Vinaigrette ingedient
• Bird-feeder food
• Auto fluid
• De-squeak
• ''Lorenzo's ___'' (1992)
• __ and vinegar
• Upton Sinclair novel that inspired 'There Will Be Blood'