The most common and most likely answer to this crossword clue is the 4 letter word NOIR
I've seen this crossword clue in The Times
N
O
I
R
More clues leading to the result NOIR
- Lack of infrared type of film
- Dubliners unlikely to feature in such films?
- Film genre‘s most important rule
- 9 in French film genre
- Rather bleak form of iron
- An expression of disbelief at extremely inferior type of film
- Concerning lack in French director’s cinematic style
- In Toulouse, black iron is tempered
- Roulette bet in or out of order
- Type of film only showing in visible and ultraviolet light?
Buddy explains!

The straight part
We know that "type of film" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case type of film = noir.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 NOIR mean?
NOIR noun- Film noir.
- A production in the style of film noir.
- Of or pertaining to film noir, or the atmosphere associated with that genre