Historical clue formulations

• Oscar winner for "The African Queen" — 2026-04-24
• Bergman's "Casablanca" co-star — 2021-06-14
• See 22-Across — 2016-07-20
• "The Return of Doctor X" star, 1939 — 2015-01-03
• "The Big Sleep" co-star, 1946 — 2012-01-01
• His last film was "The Harder They Fall," 1956 — 2010-07-10
• Frequent gangster portrayer — 2010-02-28
• American Film Institute's "greatest male star of all time" — 2006-11-10
• Spade portrayer — 2004-01-04
• Spade player — 2000-01-08
• Duke Mantee portrayer — 1996-07-19
• Filmdom's Sam Spade — 1994-05-12