Obstinately determined (6)

I believe the answer is:

dogged

(Other definitions for dogged that I've seen before include "Follow closely - persistent" , "Stubborn or determined in canine manner" , "Stubborn, in a canine kind of way" , "Persistent in a canine sort of way" , "stubbornly determined" .)

I've seen this clue in the Evening Standard.

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