To back Eric, follow two points limited to a small circle (8)

I believe the answer is:

esoteric

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But I can't explain it at all! Could you help me understand?

(Other definitions for esoteric that I've seen before include "unintelligible to outsiders" , "I set core up to be mysterious" , "Secret kind of coteries" , "Secret; taught to few" , "Other-worldly" .)

I've seen this clue in the Sydney Morning Herald.

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