Perfectionist's enumeration of notions? (8)
I believe the answer is:
idealist
This clue is a double definition.
'perfectionist's' is the first definition.
(I've seen this before)
'enumeration of notions?' is the second definition.
(idea list - list of ideas)
(Other definitions for idealist that I've seen before include "One has high hopes" , "Person with lofty and unselfish aspirations" , "Visionary" , "Person striving for perfection" , "Detail is about person with aspirations toward perfection (8)" .)