Possible Clues:

• Slip one casually into the fifth letter
• Foreign character giving old record store new start
• Piles on unfortunate character from abroad
• Greek short E
• Greek letter has postscript: the truth about it recalled
• Badly formed slope in a short letter
• Lowest caste in 'Brave New World'
• Fifth in a Greek series
• Record store given new character in Greece
• Fifth brightest star in a constellation