Possible Clues:

• In a manner of speaking it is not pollution
• It's not tea that gives it that nasty taste
• It is not commonly corrupt
• That isn't at all pleasant
• At last this is not something to spoil one
• It isn't a blemish
• '___ funny, McGee!'
• What corruption can do to sport
• First sign of tiredness isn't an infection
• It's not corruption