Historical clue formulations

• Up-start? — 2023-01-11
• Upfront? — 2020-11-01
• Ultra sound? — 2013-07-26
• There's one in "puzzle" — 2011-06-28
• Thumb's middle? — 2010-02-28
• Bug's midsection — 2007-03-02
• Vowel sound in "puzzle" — 2005-12-13