Possible Clues:

• Shakespearean character who introduced the phrase 'salad days'
• Queen making pawn act a role (of Leigh and Taylor)
• Pale actor turned out to be a drama queen
• Queen of the 54-Across
• Good part for actress - act role rewritten to involve father
• Mistress of Julius Caesar and Mark Antony
• Pale actor transformed tragic role
• Her Needle is on the Embankment in London
• Visitor to Rome in 46 B.C.
• Make actor leap about in Shakespearian role