One who applauds directors finding filmmaking equipment (12)
I believe the answer is:
clapperboard
'filmmaking equipment' is the definition.
(used on a film set)
'one who applauds directors' is the wordplay.
'one who applauds' becomes 'clapper' (someone clapping their hands).
'directors' becomes 'board' (board of directors).
'clapper'+'board'='CLAPPERBOARD'
'finding' is the link.
(Other definitions for clapperboard that I've seen before include "one way to call the shots?" , "part in film-making" , "It's used at start of filming" , "Agent of filmmaker" , "Film maker's aid" .)