Demi Moore's outside with grand French film-maker (2,5)
I believe the answer is:
de mille
'film-maker' is the definition.
(director Cecil B DeMille)
I can't explain the rest of the clue.
(Other definitions for de mille that I've seen before include "Cecil B - - (film pioneer)" , "Showman" , "Cecil B. -, producer" , "Cecil B. -, US director" , "Cecil B - - - - (films)" .)