Transplant trees and let develop (8)
I believe the answer is:
resettle
'transplant' is the definition.
(thesaurus)
'trees and let develop' is the wordplay.
'and' means one lot of letters go next to another.
'develop' is an anagram indicator.
'trees' put after 'let' is 'lettrees'.
'lettrees' is an anagram of 'RESETTLE'.
(Other definitions for resettle that I've seen before include "Colonise again" , "Move to live in a different place" , "up sticks" , "put down new roots" , "Move to new state" .)