Historical clue formulations

• Underhanded — 2025-12-20
• Double-dealing — 2025-03-15
• Devious — 2024-07-15
• Under-the-table — 2023-09-17
• Furtive — 2023-09-15
• Trying to pull a fast one — 2013-07-14
• Underhanded — 2011-02-08
• Underhanded — 2010-07-05
• Deceitful — 2010-05-04
• Underhanded — 2005-06-21
• Sly — 2005-02-16
• Backdoor — 2005-02-06
• Backdoor — 1999-06-04
• Furtive — 1997-02-06
• Guileful — 1996-01-12