One who worships procrastinator’s maxim? (8)
I believe the answer is:
idolater
'one who worships' is the definition.
(someone who worships idols)
I don't understand the rest of the clue.
(Other definitions for idolater that I've seen before include "Tailored like pagan worshipper" , "devotee" , "I'm devoted to my image" , "One who worships a false god or graven image" , "Worshipper of false gods" .)