term:

Clerk

clerk n

1 : an official responsible (as to a court) for correspondence, records, and accounts and having specified powers or authority (as to issue writs) [a city ] [ of court]
2 a : a person employed to keep records or accounts or to perform general office work
b : a person (as a law student or graduate) employed by an attorney or judge to assist with case-related tasks (as research) compare paralegal
clerk·ship n

vi : to act or work as a clerk [ed for a Supreme Court justice]