Possible Clues:

• Liberal leaves Indian city, securing good character in Patras?
• Greek letter that symbolizes summation
• Greek letter pronounced like "s"
• Scylla's head?
• Greek letter that means "sum" in math
• Successful and independent man, in slang
• Greek letter on the AutoSum button in Excel
• Little time to avoid damage to reputation for Greek character
• Leader of Sparta is to return, having fed endlessly
• Sum symbol in math