The most common and most likely answer to this crossword clue is the 5 plus 10 letter word FATAL ATTRACTION
I've seen this crossword clue in The Guardian
F
A
T
A
L
A
T
T
R
A
C
T
I
O
N
More clues leading to the result FATAL ATTRACTION
Buddy explains!
The straight part
We know that "Film" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case film = fatal attraction.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.