The most common and most likely answer to this crossword clue is the 4 plus 2 plus 5 letter word MISE EN SCENE
I've seen this crossword clue in The Times
M
I
S
E
E
N
S
C
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E
Buddy explains!

The straight part
We know that "approach to filming" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case approach to filming = mise en scene.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.
Crossword Answer definitions
MISE EN SCENE noun- Physical environment; surroundings.
- The arrangement of props and actors on a stage or for film.