Definition of Donald Maclean from the Oxford Advanced Learner's Dictionary

 

Donald Maclean

 
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(1913-83) an English spy (= person employed to find out secret information). He became a Communist as a young man at the same time as the other British spies Anthony Blunt, Guy Burgess and Kim Philby, and from 1944 worked for the British Foreign Office while acting as a spy for the Russian government. In 1951 he learned of British suspicions against him, and escaped with Burgess to Russia, where he lived until his death.