Cryptic crossword clue
Gorse and grass running wild — they will become belligerent 10

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

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

The straight part
We know that "they will become belligerent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they will become belligerent = aggressors.
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 AGGRESSORS mean?

AGGRESSORS noun
  1. The person or country that first attacks or makes an aggression; that begins hostility or a quarrel; an assailant.

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