Related Clues:

• Scent
• Gym socks may have one
• Perfume
• Aroma
• Smell
• Wavy lines, in the comics
• General feeling
• Polecat's defense
• Essence
• Olfactory input
• Olfactory offense
• Lilac, e.g.
• See 25-Across
• Stink
• Carbon monoxide's lack