Historical clue formulations

• Area 51 sighting — 2024-04-21
• Base for a teacup — 2022-07-11
• Spill catcher — 2013-09-15
• You might set one out for a cat — 2013-03-17
• Cup holder — 2012-11-25
• Dish under a teacup — 2011-08-15
• Cup holder — 2006-11-28
• It holds one cup — 2003-12-14
• Flying phenomenon — 2002-08-11
• See 10-Down — 2001-04-18
• Sci-fi transport — 1994-01-28