(collective) A group of people hired to attend a performance and to either applaud or boo.
(broadly) A group of fawning admirers.
(broadly) A group of people who pre-arrange among themselves to express strong support for an idea, so as to give the false impression of a wider consensus.
Pronounced as (IPA)
/ˈklæk/
Etymology
Borrowed from French claque (“group of people hired to applaud or boo, claque”, literally “a slap; a clap”).