Possible Clues:

• Curried
• Worked to gain experience under malign influence?
• Cooked very badly indeed!
• Old leader and lousy writer worked for barman
• Cooked very badly, needing something done about it
• Theologian admits it's profoundly immoral for the French to work for barman for nothing in the past
• Cooked, in a way, as guided by Nick
• Did research or other work for barrister - like Lucifer? (8)