Historical clue formulations

• Short — 2021-05-15
• Hidden advantage that this puzzle employs four times? — 2016-05-05
• Having debts ... or where to find a golf ball after 17-, 30-, 37- and 48-Across's starts? — 2015-09-07
• Warning before a detonation ... and a hint to 16 of this puzzle's answers — 2015-03-12
• Owing money — 2000-11-16
• Owing money — 1996-10-11
• Owing — 1994-07-30