Historical clue formulations

• Break down while studying? — 2026-02-20
• Disassemble in order to understand — 2025-08-22
• Take apart in order to reproduce ... or a hint to what's hidden in 17-, 23-, 34- and 46-Across — 2019-08-15
• Memo about a lyricist? — 2008-06-15
• Take apart to understand the design of — 2006-03-06