Historical clue formulations

• Betray … or a hint to what's found in this puzzle's shaded squares — 2022-12-27
• Betray … or a hint to what can precede each half of 17-, 25- and 43-Across — 2022-09-05
• Betray ... or a hint to four answers in this puzzle — 2021-08-15
• *Act of betrayal — 2011-12-07
• Betrayal — 2001-08-27
• Staple Le Carré feature — 1999-01-24