Merriam-Webster's Collegiate® Dictionary, 11th Edition
CLERK
I. noun see: clast Date: before 12th century cleric , scholar ,
3. 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) , one employed to keep records or accounts or to perform general office work, one who works at a sales or service counter, clerkship noun
II. intransitive verb
Date: 1551
to act or work as a clerk