Need to rearrange garden (4)
I believe the answer is:
eden
'garden' is the definition.
(I know that Eden is an garden)
'need to rearrange' is the wordplay.
'to rearrange' indicates anagramming the letters (I've seen 'rearranged' mean this).
'need' with letters rearranged gives 'EDEN'.
(Other definitions for eden that I've seen before include "Foreign Secretary" , "Old Testament garden" , "The first habitat" , "Unspoiled paradise" , "Adam and Eve home" .)