Historical clue formulations

• Lead-in to "except after C" — 2026-09-14
• Rule that's often broken — 2022-04-09
• First part of an English "rule" — 2019-08-29
• Start of a weird infraction? — 2014-09-27
• Rule broken in leisure? — 2007-10-12
• With 7-Down, an ordering principle — 2006-05-12