Absolute power missed top arrangement (9)
I believe the answer is:
despotism
'absolute power' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'missed top arrangement' is the wordplay.
'arrangement' indicates anagramming the letters.
'missed'+'top'='missedtop'
'missedtop' is an anagram of 'DESPOTISM'.
Can you help me to learn more?
(Other definitions for despotism that I've seen before include "Arbitrary government" , "Tyranny" , "Do miss pet (anag)" , "Cruel rule" , "Autocracy" .)