Imbecile (5)

I think it could be either:

moron

idiot

'imbecile' is the definition.
(I know that imbecile can be written as idiot)

This is all the clue.

(Other definitions for idiot that I've seen before include "Dostoevsky hero" , "Charlie" , "one needing head examined?" , "Stupid person" , "Dope" .)

I've seen this clue in the Evening Standard and The Mirror.

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