Articled clerk

An apprentice who has signed articles of indenture (or covenant) to a law firm. The apprentice is bound to serve for a fixed number of years, during which time he (or she) learns law. Burgess (60) says that at the time the opera was written the articled clerks paid a fee for the privilege, whereas today they are paid a salary.

Make that second word rhyme with bark.
Act I
Sketch of Articled clerk