Possible Clues:

• Greek letter between rho and tau
• Letter from Greece turning up a manuscript on a soldier
• Start for Sophocles?
• Letter American servicemen returned
• Letter on a house used by 4-Across
• Greek version of The Origin of Species
• A male, one in G and S, all-round character?
• Character central to the writing of Aesop
• Summation signifier, in math
• A classic car is back, of classic character