A salesclerk; a person who serves customers in a store or market.
A law clerk.
One who occupationally provides assistance by working with records, accounts, letters, etc.; an office worker.
An employee at a hotel who deals with guests.
A facilitator of a Quaker meeting for business affairs.
To act as a clerk, to perform the duties or functions of a clerk
The law school graduate clerked for the supreme court judge for the summer.