Crossword Genius

Obstinate but practical person it's said (4)

Ross

I believe the answer is:

dour

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'obstinate' is the definition.
(similar in meaning)

I don't understand the rest of the clue.

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(Other definitions for dour that I've seen before include "Sullen - unyielding" , "Grim, uninviting" , "'Sullen, sour (4)'" , "Severe, gloomy-looking" , "Constituent parts" .)

I've seen this clue in The Globe and Mail.
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