The most common and most likely answer to this crossword clue is the 9 plus 2 plus 8 letter word BREAKFAST AT TIFFANYS
I've seen this crossword clue in The Times
B
R
E
A
K
F
A
S
T
A
T
T
I
F
F
A
N
Y
S
More clues leading to the result BREAKFAST AT TIFFANYS
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 = breakfast at tiffanys.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.