Paradise involved need of danger (6,2,4)
I believe the answer is:
garden of eden
'paradise' is the definition.
(I've seen this before)
'involved need of danger' is the wordplay.
'involved' indicates anagramming the letters (involved can mean confusing or complex).
'need'+'of'+'danger'='needofdanger'
'needofdanger' anagrammed gives 'GARDEN OF EDEN'.
(Other definitions for garden of eden that I've seen before include "Scene in Genesis" , "holy plot?" , "Biblical paradise" , "Idyllic haunt" , "Pre-lapsarian paradise" .)