Adam's garden (4)
I believe the answer is:
eden
'adam's garden' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eden that I've seen before include "The near-perfect garden" , "5,27 [PRIME MINISTER]" , "Early garden - Cornish project" , "at Number Ten once?" , "Tory Prime Minister, 1955-57" .)