Crossword Genius

The novel Russian fathead (5)

Ross

I believe the answer is:

idiot

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

I cannot understand how the remainder of the clue works.

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(Other definitions for idiot that I've seen before include "Oaf" , "Dostoevsky hero" , "Sap" , "Dope" , "Ass, ninny" .)

I've seen this clue in the Evening Standard.
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