Need to cultivate first garden (4)
I believe the answer is:
eden
'first garden' is the definition.
(I've seen this before)
'need to cultivate' is the wordplay.
'to cultivate' is an anagram indicator (I've seen 'cultivated' mean this).
'need' is an anagram of 'EDEN'.
(Other definitions for eden that I've seen before include "heavenly spot" , "Adam and Eve home" , "The original garden?" , "Anthony ---, PM 1955" , "River - garden" .)