The word "clap" means to bring your hands together with a sudden loud sound, usually as a way to show appreciation or to create a rhythm. Full definition
Unlike the Maysles film, however, the inclusion of the raw footage - with hand claps for later synchronizing - reveal an articulate Sharif, enthusiastic and highly personable; and an exhausted Christie, who is asked remarkably daft and intrusive questions. (kqek.com)
Also they gave the onlookers pleasure by their graceful bearing and gentle clapping of hands and genuflexions.» (firstthings.com)
Common perception following the Oscars was that Brie Larson made a strong statement without saying a word by not clapping for Casey Affleck upon his win for Manchester By The Sea. (avclub.com)