I accomplish afterwards as a devotee (8)
I believe the answer is:
idolater
'a devotee' is the definition.
(someone devoted to idols)
'i accomplish afterwards' is the wordplay.
'accomplish' becomes 'do' (doing is a kind of accomplishing).
'afterwards' becomes 'later' (synonyms).
'i'+'do'+'later'='IDOLATER'
'as' acts as a link.
(Other definitions for idolater that I've seen before include "devotee" , "Person who worships graven images" , "great admirer" , "I'm devoted to my image" , "I love a religious image" .)