Possible Clues:

• Fish I preserve in centre of London
• Pub and cabin renovated in part of London
• Insult my claim to be competent as part of defence
• London complex issuing claim of competence following insult
• Watchtower over a castle gate
• About to interrupt lawyers to discard a form of defence
• Tower that is part of a defensive structure
• British going into pub I preserve in centre of London
• Repeatedly forbid engaging in charge at fortification
• London buildings with Arts Centre