sub-post office

noun

(in Britain) a post office run by a sub-postmaster or sub-postmistress as a self-employed agent for the Post Office

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012