Dreadful danger in Eden (6)
I believe the answer is:
garden
'eden' is the definition.
(I've seen this in another clue)
'dreadful danger' is the wordplay.
'dreadful' indicates an anagram.
'danger' with letters rearranged gives 'GARDEN'.
'in' is the link.
(Other definitions for garden that I've seen before include "Danger (anag.)" , "Where, eg, flowers are grown" , "fertile region" , "House with extensive grounds" , "-- City; -- centre" .)