Possible Clues:

• Prolonged rivalry
• Looks after animals around finale over at blood feud
• One obliged, we're told, to back archdeacon in dispute
• Bitter quarrel initially talked about after surgeon pockets tip
• Long bitter row
• Sell death-trap missing odd parts in feud
• Prolonged quarrel
• Feud: cheers following check about outcome
• Check about objective before reserves feud
• Long-running feud