Height of evil -- atone somehow (9)
I believe the answer is:
elevation
'height' is the definition.
(thesaurus)
'evil atone somehow' is the wordplay.
'somehow' indicates an anagram.
'evil'+'atone'='evilatone'
'evilatone' with letters rearranged gives 'ELEVATION'.
'of' is the link.
(Other definitions for elevation that I've seen before include "plan" , "Side of a building; height" , "scale drawing" , "Height above sea level" , "Leave it on for altitude of a place" .)