Wiktionary
n. (context legal English) A form of apprenticeship for prospective barristers
Wikipedia
A pupillage, in England and Wales and Northern Ireland is the compulsory training contract for BPTC graduates. In Hong Kong it is the final stage of qualification for a barrister, but it is not contractual. Pupillage is similar to an apprenticeship, during which bar graduates build on what they have learnt during the course by combining it with practical work experience in a set of barristers' chambers.
Usage examples of "pupillage".
And on top of that, you require enough money to keep yourself for the years of your pupillage and articles.
Nor do I want to sit vigil over any more living corpses because you were tied up in disputes over pupillage agreements when you were needed to defend someone else.