Possible Clues:

• Unhappy at event including daughter leading to feud
• Noun related to ''vindictive''
• Sell deathtrap, occasionally the cause of bitter feud
• Vetted an order for bad blood
• Literally, "revenge"
• Feud involving archdeacon and one owing money, do we hear?
• Bitter feud between families involving murder and revenge
• Old soldier cheers, about to finish ongoing conflict
• Quarrel unexpectedly at event involving daughter
• Surgeon accepts death, thanks to bad blood