Unsoiled (anag) — false idea (8)

I believe the answer is:

delusion

(Other definitions for delusion that I've seen before include "Mistaken belief in the face of contradictory evidence" , "Unsoiled sort of hallucination" , "Belief contradicted by reality" , "Belief held in the face of all contrary evidence" , "False or mistaken belief" .)

I've seen this clue in The Guardian.

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