Need to transform the garden (4)
I believe the answer is:
'garden' is the definition.
(I've seen this before)
'need to transform' is the wordplay.
'to transform' is an anagram indicator.
'need' anagrammed gives 'EDEN'.
'the' is the link.
(Other definitions for eden that I've seen before include "PM, 1955-57" , "Delightful place" , "Adam and Eve's garden" , "Someone once seen in Number Ten's" , "River - garden" .)