SCPsomeone in Britain who sometimes works as a police officer without being paid, and who also has another main job 〔英国不领工资、另有正职的〕特种警察
Examples from the Corpus
special constable• Seven other County Durham officers and a special constable have also been commended by the chiefconstable.• Too old to fight, he had served as a special constable during the war.• He became a special constable, a member of the local emergencycommittee.• Every one else was virtually a special constable. ... The women were better.