A listed arrangement of minor matters (7)
I believe the answer is:
details
'minor matters' is the definition.
The definition and answer can be both related to thinking as well as being plural nouns.
Maybe you can see a link between them that I can't see?
'a listed arrangement' is the wordplay.
'arrangement' is an anagram indicator.
'a'+'listed'='alisted'
'alisted' is an anagram of 'DETAILS'.
'of' is the link.
Can you help me to learn more?
(Other definitions for details that I've seen before include "Small features" , "Particulars, small parts" , "Minutiae" .)