Possible Clues:

• ''__ in shirt-sleeves'' (Thomas Wolfe's term for a yes-man)
• Smell ___ (sense foul play)
• It's sometimes smelled
• I smell ___
• Smell -- (suspect foul play)
• Something sometimes smelled
• Smell -- (suspect something)
• 'I smell --!' ('This is fishy!')
• 'Was it ___ I saw?' (cat's palindrome)
• "I smell ___" (words of suspicion)