Related Clues:

• Gym socks may have one
• Perfume
• Aroma
• Smack (of)
• Smell
• Wavy lines, in the comics
• Polecat's defense
• Common sense
• Essence
• Olfactory input
• Get wind of
• Olfactory offense
• Common sense?
• Lilac, e.g.
• See 25-Across