Perfect Irish magistrate shows romantic vision (8)
I believe the answer is:
idealism
'romantic vision' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'perfect irish magistrate' is the wordplay.
'perfect' becomes 'ideal' (similar in meaning).
'irish magistrate' becomes 'ism' (I am not sure about this - if you are sure you should believe this answer much more).
'ideal'+'ism'='IDEALISM'
'shows' is the link.
Can you help me to learn more?
(Other definitions for idealism that I've seen before include "Utopian pursuit" , "Mental state of seeking perfection or highest standards" , "Desire for perfection" , "The pursuit of perfection" , "Thoughts of perfection for miladies" .)