Need to reform the original garden (4)
I believe the answer is:
eden
'original garden' is the definition.
(I've seen this in another clue)
'need to reform' is the wordplay.
'to reform' indicates anagramming the letters (letters in a new form).
'need' anagrammed gives 'EDEN'.
'the' is the link.
(Other definitions for eden that I've seen before include "Place of unspoilt beauty" , "The best of all gardens" , "Genesis location" , "Biblical garden" , "Place of unspoiled beauty" .)