Possible Clues:

• Vetted an orderly, causing relative bitterness
• A prolonged feud, associated with Sicily
• Lasting feud associated with Sicily and mafia
• Feud involving archdeacon and defaulter on radio
• Few'd quarrel with this, by the sound of it
• Sicilian blood feud
• A family feud in Sicily
• 'The Godfather' story line
• Few's have sounded so deadly as this
• A prolonged feud of Sicilian origin