Garden of Genesis (4)
I believe the answer is:
eden
'garden of genesis' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for eden that I've seen before include "Adam and Eve's 19" , "happy state" , "The most enchanting garden of all" , "5,27 [PRIME MINISTER]" , "The perfect garden in need" .)