Historical clue formulations

• Cute sound? — 2025-08-23
• The last sound in "Keanu," e.g. — 2023-11-13
• Center of Pluto? — 2022-10-14
• Usual beginning? — 2022-08-24
• Vowel sound heard twice in "true blue" — 2021-08-23
• Union leader? — 2014-03-16
• "Cute" sound — 2013-08-21
• "Rude" sound — 2011-12-14
• The vowel sound in "dude" — 2004-09-27