Wrong but prevalent notion (7)

I believe the answer is:

fallacy

'wrong but prevalent notion' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for fallacy that I've seen before include "Illogical argument" , "Faulty argument" , "Incorrect notion based on false reasoning" , "'Misconception, false belief (7)'" , "Wrong but prevalent notion" .)

I've seen this clue in The Sun and The Guardian.

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