Wiktionary
n. (context legal English) An apprentice in law.
Wikipedia
An articled clerk, also known as an articling student, is an apprentice in a professional firm in Commonwealth countries; generally the term arises in the accountancy and legal professions. The articled clerk signs a contract, known as "articles of clerkship", committing to a fixed period of employment. Wharton's Law Lexicon defines an articled clerk as "a pupil of a solicitor, who undertakes, by articles of clerkship, continuing covenants, mutually binding, to instruct him in the principles and practice of the profession". The contract is with a specific partner in the firm and not with the firm as a whole.
Apprentice architects can also be articled. Henry Percy Adams articled to Britwen Binyon (1846-1909) architect.
Nowadays some professions in some countries prefer to call their apprentices "students" or "trainees" (e.g. a trainee solicitor) and the articles of clerkship " training contracts".
Usage examples of "articled clerk".
I'm an articled clerk with Newby and Paramore, your instructing solicitor 'in the Vernon case.
The auditors of the Courtney Mining and Finance, Messrs Rifkin and Markovitch, had been prevailed upon, not without some misgivings on their part, to accept Sean as an articled clerk.
He could have taken his law degree to some comfortable firm of solicitors in Derby and become an articled clerk.