They're very forceful leading the charge to chop up gorse, grass (10)
I believe the answer is:
aggressors
'they're very forceful leading the charge' is the definition.
The definition suggests an adverb but the answer is not.
'chop up gorse grass' is the wordplay.
'chop up' indicates anagramming the letters (I've seen this in other clues).
'gorse'+'grass'='gorsegrass'
'gorsegrass' is an anagram of 'AGGRESSORS'.
'to' is the link.
Can you help me to learn more?
(Another definition for aggressors that I've seen is " Hostile attackers".)