Possible Clues:

• What one associates with the rape of the countryside?
• Canola, for one
• Source of lubricant old ailing diesel needed
• The product of rape does lie badly
• Sesame, e.g.
• Old diesel replaced by organic fuel source
• The product of plants such as rape
• Castor or sesame
• Castor bean or sesame, e.g.
• Sesame or flax, e.g