Stir up (anag) — nit-picker (6)

I believe the answer is:

purist

(Other definitions for purist that I've seen before include "One who insists on precision and correctness" , "Stir up (anag) - pedant" , "scrupulous" , "Pedantic type" , "Fastidious person" .)

I've seen this clue in The Guardian.

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