Possible Clues:

• Russian dramatist
• Anton ..., Russian dramatist
• Uncle Vanya author
• Russian playwright, d. 1904
• Anton -, dramatist (The Cherry Orchard)
• What we might send, say, for his Uncle Vanya?
• Author to mark with a tick, say
• Anton —, Russian dramatist
• Wrote The Seagull and Three Sisters
• Reported check, before second and third moves, on Russian dramatist