Historical clue formulations

• Tattle on ... or an instruction for answering 22-Across — 2025-06-19
• Snitch on — 2024-03-18
• Squeal on — 2016-11-27
• Fink on — 2006-10-08
• Tell on — 2006-09-13
• Fink on — 2000-04-02