The most common and most likely answer to this crossword clue is the 12 letter word BLOODTHIRSTY
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More clues leading to the result BLOODTHIRSTY
Buddy explains!

The straight part
We know that "describing some horror films" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case describing some horror films = bloodthirsty.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 BLOODTHIRSTY mean?
BLOODTHIRSTY adjective- Thirsty for blood: inexorably violent or eager for bloodshed; murderous.
- Of a book, film, etc.: depicting much violence; gory, violent.