Crossword Genius

Gorse and grass running wild — they will become belligerent (10)

Ross

I believe the answer is:

aggressors

'they will become belligerent' is the definition.
(aggressors are belligerent people)

'gorse and grass running wild' is the wordplay.
'and' means one lot of letters go next to another (I've seen this in other clues).
'running wild' indicates an anagram.
'gorse' put after 'grass' is 'grassgorse'.
'grassgorse' with letters rearranged gives 'AGGRESSORS'.

(Another definition for aggressors that I've seen is " Hostile attackers".)

I've seen this clue in The Guardian.
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