Dostoyevsky novel (3,5)

I think it could be either:

Which length description are you looking for?:

3,5

the idiot

'dostoyevsky novel' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for the idiot that I've seen before include "Dostoevsky novel" , "Dostoyevsky novel" , "Russian novel" .)

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