Crossword Genius

Got up, sore and confused (4)

Ross

I believe the answer is:

rose

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But I can't explain it at all! Could you help me understand?

(Other definitions for rose that I've seen before include "Perforated cap; reddish colour" , "Pinkish wine" , "Gained altitude" , "was being promoted" , "reached for the skies" .)

I've seen this clue in The Mirror.
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