Clear vegetation, not very tangled (9)
I believe the answer is:
negotiate
'clear' is the definition.
(thesaurus)
'vegetation not very tangled' is the wordplay.
'not' indicates named letters should be taken away.
'very' becomes 'v' (abbreviation).
'tangled' indicates anagramming the letters.
'vegetation' with 'v' taken out is 'egetation'.
'egetation' anagrammed gives 'NEGOTIATE'.
(Other definitions for negotiate that I've seen before include "Find a way over (a difficult path)" , "I get a note (anag) - bargain" , "as diplomat does" , "Deal, bargain" , "treat! Yes!" .)