Person for whom it's all or nothing (6)

I believe the answer is:

purist

(Other definitions for purist that I've seen before include "Over-fastidious person" , "Fastidious person" , "Stickler for correctness, especially in language" , "One who insists on precision and correctness" , "Stir up (anag) - pedant" .)

I've seen this clue in the USA Today.

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