Possible Clues:

• Relative admits setting up first alternative commercial Internet site for source of protein
• Asian oil producer's child welcoming a site for selling to the west
• A bone, say, could be a valuable source of protein
• Protein-rich veg.
• Legume
• Oil supplier employed a sane boy
• Corn Belt crop
• A website devoted to selling, in numbers, revolutionary protein source
• Source of protein
• Vegetable source of protein