Historical clue formulations

• Pilot's opposite — 2020-05-31
• Show stopper? — 2018-12-30
• Showstopper, literally — 2018-07-04
• It may be grand — 2017-06-11
• See 39-Across — 2011-12-26
• "Grand" thing — 2005-06-12
• Windup — 2003-01-05
• Closing number — 2002-04-23
• Denouement — 2000-01-22