From Longman Dictionary of Contemporary Englishflackflack /flæk/ noun 1 [uncountable] another spelling of flak2 [countable] American English informal someone whose job is to represent an organization and answer questions about it, especially when something bad has happened They spent millions on lobbyists and flacks to improve their image.
Examples from the Corpus
flack• The flack grimaced and walked away, muttering.From Longman Business Dictionaryflackflack /flæk/ (also flak) noun [countable] American English informal a person whose job is to represent an organization and talk to newspaper and television reporters, answering their questions about a negative story involving the organizationHe put a shield between himself and the press by hiring a flack to handle media calls. → compare press agent, publicist 