Related Clues:

• Essence
• Exorbitant
• Olfactory input
• Get wind of
• Olfactory offense
• Big initials at Indy
• Lilac, e.g.
• Indy 500 sponsor
• See 25-Across
• Stink
• Carbon monoxide's lack
• Lead for a Lab
• Whiff
• It may be left in a locker
• Garlic, for one