Mental model found in Nietzsche, maybe (6)

I believe the answer is:

schema

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'mental model' is the definition.
'schema' can be an answer for 'model' (I've seen this before). I'm not certain of the 'mental' bit.

'in nietzsche maybe' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SCHEMA' is hidden within 'nietzsche maybe'.

'found' acts as a link.

Can you help me to learn more?

(Other definitions for schema that I've seen before include "essential form" , "Proposed arrangement" , "Synopsis" , "Outline or model of a technical plan or theory" , "Outline plan or theory - he's Mac (anag)" .)

I've seen this clue in The Times.

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