Cast-of-thousands film (4)
I believe the answer is:
epic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cast-of-thousands film</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for epic that I've seen before include "On a grand scale like long poem" , "Long adventure story" , "Larger than life" , "Of heroic proportions" , "Long poem telling of heroic events" .)