Cryptic crossword clue
Crashing gears gives feeling full of hostility 10

The most common and most likely answer to this crossword clue is the 10 letter word AGGRESSIVE

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "feeling full of hostility" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case feeling full of hostility = aggressive.
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 AGGRESSIVE mean?

AGGRESSIVE adjective
  1. Characterized by aggression; unjustly attacking; prone to behave in a way that involves attacking or arguing.
  2. Of heuristics, source code optimization techniques, etc.: exploiting every opportunity to be applied.
  3. (of a tumour or disease) That spreads quickly or extensively; virulent; malignant.

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