Attitude of procrastinator or heretic (8)
I believe the answer is:
idolater
'heretic' is the definition.
(idolatry is a kind of heresy)
I cannot understand how the remainder of the clue works.
(Other definitions for idolater that I've seen before include "Aaron, perhaps, in Moses' absence" , "devotee" , "One who worships a false god or graven image" , "I love a religious image" , "I'm devoted to my image" .)