Possible Clues:

• The 'sour' in sweet-and-sour
• Healer with brown paper form given gas
• Volume in anger rising, revealing bitter stuff
• Sour grapes over food?
• Partner of oil
• Cheap salad dressing
• Salt's mate in storm going west behind vessel's bow
• Salad dressing, given a shake, at last runnier
• Pickling medium
• Mounting anger after French wine proves acidic stuff