Study about soul I misrepresented in error (8)
I believe the answer is:
delusion
'error' is the definition.
(thesaurus)
'study about soul i misrepresented' is the wordplay.
'study' becomes 'den' (I've seen this before).
'about' is an insertion indicator.
'misrepresented' indicates an anagram.
'soul'+'i'='souli'
'souli' anagrammed gives 'lusio'.
'den' going around 'lusio' is 'DELUSION'.
'in' acts as a link.
(Other definitions for delusion that I've seen before include "Unsoiled sort of hallucination" , "Mistaken belief in the face of contradictory evidence" , "Belief held in the face of all contrary evidence" , "Misguided belief" , "Unsoiled kind of hallucination" .)