Crossword Genius

Mistaken idea (8)

Ross

I believe the answer is:

delusion

(Other definitions for delusion that I've seen before include "Misconception - deception" , "Erroneous belief" , "Belief held in the face of all contrary evidence" , "False impression" , "Unsoiled sort of hallucination" .)

I've seen this clue in The Independent.
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