Historical clue formulations

• "That just might work!" — 2023-01-13
• "That's good thinking!" — 2022-04-13
• "Good thinking!" — 2016-08-26
• "Why didn't I think of that?!" — 2015-12-13
• Bit of cleverness — 2014-12-02
• "Clever thinking!" — 2014-02-14
• "That's clever!" — 2013-11-23
• Bit of ingenuity — 2012-08-10
• "Clever thinking" — 2006-07-16
• "Clever thinking!" — 1998-07-25