Possible Clues:

• "Planet of the Apes" role for Andy Serkis
• Salad with anchovies and croutons
• Emperor about right to hold tide back
• See 13 Across
• Dressing gets wiped out in middle of March
• Roman autocrat
• See 27 Across
• Roman ruler who said 'The die is cast'
• Caught Russell reviewing race? It wasn't his wife, as she's above suspicion!
• '___ and Cleopatra' (Shaw play)