Historical clue formulations

• Flatten — 2023-03-05
• Kind of makeup — 2018-10-17
• Flatten — 2018-10-17
• Breakfast food item — 2018-10-17
• Flatten — 2017-10-05
• Edible floppy disk? — 2012-05-26
• Flatten — 2011-05-13
• 51-Across, e.g. — 1999-12-11