The most common and most likely answer to this crossword clue is the 10 letter word SCREENPLAY
I've seen this crossword clue in The Daily Telegraph
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Buddy explains!

The straight part
We know that "film script" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case film script = screenplay.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SCREENPLAY mean?
SCREENPLAY noun- (authorship) A script for a movie or a television show.