C1 n (Government, Politics & Diplomacy) a. a person whose job is supervisory or clerical, or who works in junior managementb. (as adjective): C1 worker. See also occupation groupings Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014C1A member of the occupation grouping typically consisting of junior managers, supervisors, and clerical workers.Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited