Possible Clues:

• One who applauds directors finding filmmaking equipment
• One applauding directors — one of those on film set?
• One who applauds committee's filming equipment
• Round of applause for every managing body giving signal for action
• One applauding directors for part in film-making
• One who applauds directors may be employed in film-making
• Film maker's aid
• It's used at start of filming