Possible Clues:

• 5th Greek letter
• Greek character piles on the agony
• First letter is open, perhaps letter from abroad
• 5th letter of the Greek alphabet
• Letter from old record store on origin of needles
• That would make one slip for a letter in Greece
• One's lip (anag)
• Fifth character recording number in underground chamber? On the contrary
• Fraternity letter
• Greek 'e'