The most common and most likely answer to this crossword clue is the 10 letter word CROCODILES
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Buddy explains!

The straight part
We know that "Dangerous animals" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dangerous animals = crocodiles.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 CROCODILES mean?
CROCODILES noun- Any of the predatory amphibious reptiles of the family Crocodylidae; a crocodilian, any species of the order Crocodilia, which also includes the alligators, caimans and gavials.
- A long line or procession of people (especially children) walking together.
- A fallacious dilemma, mythically supposed to have been first used by a crocodile.
- To speak one's native language at an Esperanto-language gathering, rather than Esperanto.