Reproduce acer tree anew (8)
I believe the answer is:
recreate
'reproduce' is the definition.
(thesaurus)
'acer tree anew' is the wordplay.
'anew' is an anagram indicator.
'acer'+'tree'='acertree'
'acertree' with letters rearranged gives 'RECREATE'.
(Other definitions for recreate that I've seen before include "Bring back" , "Produce again" , "design again" .)