Need to plough garden (4)
I believe the answer is:
eden
'garden' is the definition.
(Garden of Eden in the Bible)
'need to plough' is the wordplay.
'to plough' indicates an anagram (I've seen 'ploughing' mean this (to plough is to break up or disrupt)).
'need' is an anagram of 'EDEN'.
(Other definitions for eden that I've seen before include "Perfect place" , "project in the south west" , "A Conservative PM" , "In need of a great garden" , "Early garden - Cornish project" .)