Possible Clues:

• In American editions name is changed
• Now that's it's been changed it's afternoon
• A Frenchman came to the conclusion that it had improved
• Corrected at noontime
• Carried out reforms PM began?
• That's when it's noon for a change
• Corrected at noon?
• 28 across set out to get things put right
• At noon I'm finished
• Like our Constitution