From Longman Dictionary of Contemporary Englishspecial constableˌspecial ˈconstable noun [countable] SCPsomeone in Britain who sometimes works as a police officer without being paid, and who also has another main job
Examples from the Corpus
special constable• Seven other County Durham officers and a special constable have also been commended by the chief constable.• Too old to fight, he had served as a special constable during the war.• He became a special constable, a member of the local emergency committee.• Every one else was virtually a special constable. ... The women were better. 