Related Clues:

• Emit effluvium
• Must, e.g.
• Olfactory stimulus
• Give olfactory offense
• ''What died?'' provocation
• Gasoline additive
• Reason to bathe
• Freshness indicator
• "What died?" provocation
• Nitrogen's lack
• Nose wrinkler
• Garlic quality
• Be offensive, in a way
• It may seep from an onion patch
• Le Pew's defense