From Longman Dictionary of Contemporary Englishfront manˈfront man noun [countable usually singular] 1 REPRESENTa person who speaks for an organization, for example an illegal one, but is not the leader of it2 (also frontman) the leader, and usually the singer, of a musical group
Examples from the Corpus
front man• He was a dynamic band leader and charismatic front man who sang and played saxophone, keyboard and percussion.• He was a good front man, but the real work was done by his team of four assistants.• Giovanni was alleged to be the front man for a fascist movement.From Longman Business Dictionaryfront manˈfront man noun (plural front men) [countable]JOB someone who represents an organization to the public, but who does not lead itHe was a good front man, but the real work was done by his team of four assistants. 