False or mistaken belief (8)

I believe the answer is:

delusion

'false or mistaken belief' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for delusion that I've seen before include "Misapprehension" , "Misguided belief" , "Belief contradicted by reality" , "Mistaken belief in the face of contradictory evidence" , "Fallacy" .)

I've seen this clue in The Irish Times.

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