Possible Clues:

• Bit of oil in motor encompassing velocity zero
• Pungent material which can be synthetically derived from turpentine
• A solid essential oil used as a liniment in medicine
• Aromatic substance used as an insect repellent
• Essential oil obtained from the cinnamon tree
• Essential oil derived from cinnamon trees
• Aromatic substance that repels insects
• Liniment affected head of runner initially
• Essential oil from cinnamon trees
• Medicinal inhalant