noun
copyreading department; copy desk
Refers to the department in a newspaper or publishing company responsible for copyreading, editing, and preparing articles for publication.
彼は新聞社の整理部で働いている。
He works in the copyreading department of a newspaper company.
Compound of 整理 (せいり, 'arrangement, sorting') and 部 (ぶ, 'department'). The term is straightforward and transparent in meaning.