Possible Clues:

• Correct manner needing rewrite of tweet? Quite — not woke at first
• ... quite badly wetted, content-wise, in customs
• English mostly snigger about that French behavioural code
• Quite upset by unrestrained character's manners
• Code of behaviour
• Convention like 13 across has level of intelligence for providing half the silhouette
• Rules of behaviour
• Tweet quite out of order -- women ignored acceptable behaviour
• What bows were once examples of
• Civility