law clerk

:  a binding custom or practice of a community :  a rule of conduct or action prescribed (see prescribe 1a) or formally recognized as binding or enforced by a controlling authority

:  the whole body of such customs, practices, or rules

:  common law

:  litigate

:  to sue or prosecute at law

:  cleric

:  scholar

:  an official responsible (as to a government agency) for correspondence, records, and accounts and vested with specified powers or authority (as to issue writs as ordered by a court)

:  to act or work as a clerk