Related Clues:

• Salad dressing ingredient
• Services, in a way
• Works at the Met
• Canvas cover
• Takes care of the squeaky wheel
• Kitchen staple
• Some paintings
• Portraitist's medium
• Rembrandts, e.g.
• Squelches a squeak
• Standard varieties
• Rembrandt works
• Impressionist works
• Virgin product, sometimes
• Pesto ingredient