Drop all the actors (4)
I believe the answer is:
cast
This clue is a double definition.
'drop' is the first definition.
('cast' can be a synonym of 'drop')
'all the actors' is the second definition.
(I've seen this before)
(Other definitions for cast that I've seen before include "The acting complement of a play" , "Throw; shed; mould" , "Provided players" , "Shy - group of actors" , "Character" .)