Wickedness I left behind at home, years later (8)
I believe the answer is:
iniquity
'wickedness' is the definition.
(I know that wickedness can be written as iniquity)
'i left behind at home years later' is the wordplay.
'left' becomes 'quit' (I've seen this before).
'behind' is a charade indicator (letters next to each other).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'years' becomes 'y' (abbreviation).
'later' says to put letters next to each other.
'i'+'quit'='iquit'
'iquit' put after 'in' is 'iniquit'.
'iniquit'+'y'='INIQUITY'
(Other definitions for iniquity that I've seen before include "Great wickedness or injustice" , "Evil, wickedness" , "Evil act" , "Sin" , "Highly unfair or immoral behaviour" .)