The most common and most likely answer to this crossword clue is the 8 letter word GORILLAS
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More clues leading to the result GORILLAS
Buddy explains!

The straight part
We know that "Creatures" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case creatures = gorillas.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 GORILLAS mean?
GORILLAS noun- The largest of the apes, native to the forests of central Africa, and known for their trait of knuckle-walking.
- A big and brutish man or a thug; a goon or ruffian.
- A powerful person or organization; a heavyweight or behemoth.