clapperboy

clapperboy

(ˈklæpəˌbɔɪ)
n
a boy who operates a clapper
References in periodicals archive ?
His father, Louis Debney, worked there for more than 40 years, starting as a clapperboy on "Snow White and the Seven Dwarfs" and eventually becoming a producer on TV shows such as "Zorro" and "Walt Disney's Wonderful World of Color.
It's the sort of movie even the clapperboy would want his name taken off the credits.