Related Clues:

• Olfactory challenge, at times
• Olfactory stimulant
• Nasal appraisal
• Outhouse issue
• Stimulator of canine curiosity
• Picked-up feeling
• It could be fishy
• Gas-leak clue
• Olfactory property
• It may linger
• It may waft
• Barbecue factor
• Arrid target
• Flagrant fragrance
• Instinctive feeling