One who occupationally works with records, accounts, letters, etc.; an office worker.
A facilitator of a Quaker meeting for business affairs.
In the Church of England, the layman that assists in the church service, especially in reading the responses (also called parish clerk).
A cleric or clergyman (the legal title for clergy of the Church of England is "Clerk in Holy Orders", still used in legal documents and cherished by some of their number).
A scholar.
To act as a clerk, to perform the duties or functions of a clerk