Eve's ruin wrecked absolutely everything (8)
I believe the answer is:
universe
'absolutely everything' is the definition.
(everything in the universe)
'eve's ruin wrecked' is the wordplay.
'wrecked' is an anagram indicator.
'eves'+'ruin'='evesruin'
'evesruin' is an anagram of 'UNIVERSE'.
(Other definitions for universe that I've seen before include "mind-boggling concept" , "sphere of activity" , "Everything that exists anywhere" , "The whole of creation" , "Everything, really" .)