Possible Clues:

• Letter revealing a political leader's after 1,000 a year
• Italian sportswear brand named after a Greek letter
• Alpha ___ Alpha (first African American sorority)
• Beta follower?
• Tenth of a series
• Letter for a scholar?
• Hellenic consonant
• Greek character one's employed in a bottling plant, we hear
• A bit of Greek apparently
• Letter after Beta in a society's name