Tizzi..if it's any help I had put Queen's Counsel to start with but this would not fit with the down clues. Hence I found this on wikipedia
The Queen's Proctor (or King's proctor) is the proctor or solicitor representing the Crown in the courts of probate and divorce.
Why is it that when someone says they have worked with the law and gives you an answer tizzi, you are still not confident? Anyway, you have your confirmation now! Happy New Year!