Historical clue formulations

• Performer whose face is rarely seen — 2022-11-25
• Stand-in during a film shoot ... or a hint to 17-, 25-, 38- and 51-Across — 2021-05-24
• *Actor's stand-in — 2019-04-30
• *Movie stand-in — 2014-07-23
• Person who looks exactly like another — 1999-08-03