The most common and most likely answer to this crossword clue is the 4 plus 3 plus 5 letter word CALL THE SHOTS
C
A
L
L
T
H
E
S
H
O
T
S
Buddy explains!
The straight part
We know that "What a film director might do/be in command" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what a film director might do/be in command = call the shots.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.