To make or to cause something to make a short sharp sound or series of sharp sounds: Janet asked Violet, “Why do your heels clack so loudly when you walk around in the office?”

A series of loud slaps or hits on a surface: Malcolm could hear the clack of the shoes of the concert participants behind him as they were going down the stairs of the auditorium during the intermission.

1. A group of people who are hired to applaud at a performance; such as, a musical, ballet, or other entertaining event: When the politician spoke there was always a claque responding with an applause of approval.
2. A group of sycophants or fawning admirers: A claque of apparent worshipers was always around the actress praising her for everything she said or did.