Historical clue formulations

• "It's a ___!" — 2026-04-16
• "Three may keep a ___, if two of them are dead": Benjamin Franklin — 2024-08-25
• With 46-Across, some areas in Clue … or a hint to the first, fourth, twelfth and fifteenth rows of this puzzle — 2024-04-11
• Tryst partner / Discharging, as a liquid — 2022-05-22
• When revealed in this puzzle, it reverses the meanings of the answers to the starred clues — 2021-09-29
• It's meant to be kept — 2021-05-26
• Hush-hush — 2021-03-01
• Clandestine — 2018-02-25
• Like some handshakes and formulas — 2017-12-26
• Confidence — 2015-06-20
• Under wraps — 2013-09-25
• It can be dangerous when leaked — 2013-05-17
• Hidden — 2013-02-03
• With 74-Across, voting system that affords anonymity ... or the theme of this puzzle? — 2012-11-06
• With 34-Across, company's present occasion? — 2012-10-13
• Diary tidbit — 2012-09-30
• Nothing to write home about? — 2011-06-07
• It may be under your hat — 2008-03-26
• It may be hard to keep — 2004-12-05
• Shrouded — 2003-08-16
• Not meant to be repeated — 2002-03-31
• Spy's quest — 2002-02-01
• Hush-hush — 2001-02-20
• Hush-hush — 2001-02-05
• Hush-hush — 1999-12-13
• Whispered words — 1999-07-15
• Closet — 1998-01-24
• Confidential matter — 1997-10-20
• Hush-hush — 1995-04-27
• Hush-hush — 1995-01-14
• Like some identities — 1994-07-22