Historical clue formulations

• Deep down — 2025-12-02
• Deep down — 2022-12-20
• Fundamentally — 2021-05-13
• Deep down inside — 2020-11-17
• See 67-Across — 2018-10-15
• Intrinsically — 2016-10-13
• Deep down inside — 2015-09-07
• Fundamentally — 2013-09-30
• Fundamentally — 2013-06-30
• Fundamentally — 2012-11-24
• Deep down — 2011-08-06
• Intrinsically — 2009-12-13
• Inside — 2008-11-22
• Inside — 2006-06-17
• Deep down — 2004-02-24
• Fundamentally — 1994-12-01