The phrase "young clerk" refers to a person working as an assistant or employee in an office or store who is at a relatively early stage in their career and is usually younger in age. Full definition
An invented subplot centers on Harlan's idealistic young clerk, who discovers the precedent that leads to the Court's overturning Ali's conviction. (si.com)
Indeed, the first hour chronicles his increasing attachment to his sweetly timid young clerk (Zoe Kazan). (latimes.com)
As a young clerk in the Caribbean, he worked hard and «read every treatise on the shelf» before getting sent to King's College — now Columbia University. (businessinsider.com)