Possible Clues:

• Snoopy's foe
• Snoopy's nemesis
• Famed aviator
• Wine store raided by old fighter pilot
• Von Richthofen (a socialist peer?)
• Snoopy's archenemy
• ''Flying Circus'' nickname
• Dogfighter concerned with fellow going round pub
• Famed Fokker flier
• Wine to accompany beef for pilot