In the position to mediate? (7)

I believe the answer is:

central

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'in' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for central that I've seen before include "Key" , "like this answer" , "Extremely important" , "Focal" , "Near the middle" .)

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