Boards held in front of a movie camera are banged together

• Photographic equipment used to synchronize sound and motion picture
• PR place moved by executives - it's used by directors?
• One who applauds committee's filming equipment

Wiktionary Word definitions in Wiktionary
n. (context film English) A device used in film production, having hinged boards that are brought together with a clap, used to synchronize picture and sound at the start of each take of a motion picture or other video production.

Wikipedia Word definitions in Wikipedia
A clapperboard is a device used in filmmaking and video production to assist in the synchronizing of picture and sound, and to designate and mark particular scenes and takes recorded during a production. The sharp "clap" noise that the clapperboard makes ...

WordNet Word definitions in WordNet
n. photographic equipment used to synchronize sound and motion picture; boards held in front of a movie camera are banged together

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
clapperboard \clap"per*board`\ (kl[a^]p"p[~e]r*b[=o]rd`), n. a device which synchronizes sound and picture while making a motion picture, consisting of boards held in front of a movie camera, which are are banged together.