Historical clue formulations

• "Language" that explains the answers to the six starred clues — 2019-08-07
• EBay ashtray, e.g. — 2019-03-15
• Hint to interpreting the five starred clues — 2014-12-18
• Playground lingo — 2011-08-10
• X-ray for Rex, say — 2005-07-22
• Not-so-secret secret language — 2003-01-07
• Ashtray, vis-à-vis trash — 2002-06-28
• See 2-Down — 1999-11-05