What it means
In Australia the legal profession is largely split into solicitors and barristers. Solicitors deal directly with clients, give advice, prepare documents and run the file. Barristers are specialist advocates who appear in court and give expert opinions, usually engaged (briefed) by a solicitor rather than approached directly. In a contested case you may have both: a solicitor managing the matter and a barrister presenting it at the hearing.
How it's used
Her solicitor prepared the evidence and then briefed a barrister to argue the case in the Supreme Court.