Related Clues:

• Stink
• Carbon monoxide's lack
• Lead for a Lab
• Whiff
• It may be left in a locker
• Garlic, for one
• Sure target
• Pervasive quality
• Fungus byproduct
• Hound's trail
• Suggestion
• Something the nose knows
• On the ___
• Bloodhound's guide
• Unpleasant aura