Proportion Stalin found out to be anti-supernatural (11)

I believe the answer is:

rationalist

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'be anti-supernatural' is the definition.
I can't tell whether this definition defines the answer.

'proportion stalin found out' is the wordplay.
'proportion' becomes 'ratio' (I've seen this in another clue).
'found out' indicates anagramming the letters (discovered out of the normal letter order).
'stalin' is an anagram of 'nalist'.
'ratio'+'nalist'='RATIONALIST'

'to' is the link.

Can you help me to learn more?

(Other definitions for rationalist that I've seen before include "Logical thinker" , "Reasoning person" .)

I've seen this clue in The Irish Independent.

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