Related Clues:

• Olive, for one
• It's often crude
• It may be called on the battlefield
• Spill material
• Cooking need
• Service station service
• Frying need
• It's symbolized by a white flag
• Frying medium
• Source of the Ewing fortune
• Drill target
• Anoint
• Break in hostilities
• Unctuous stuff
• Result of a handshake, maybe