Related Clues:

• Olfactory perception
• Hunt à la hounds
• Chanel No. 5, e.g.
• Trail marker
• Detect like a dog
• Soft, blue-gray mineral
• Gasoline additive
• Word in the title of a Pacino film
• Chanel offering
• Trail for a hound
• Potpourri emanation
• Odor
• Obsession, for one
• Lead source
• Means of detection