Crossword Genius

Person not willing or able to change (8)

Ross

I believe the answer is:

dinosaur

(Other definitions for dinosaur that I've seen before include "Prehistoric reptile" , "Extinct monster like Barney, children's TV pal" , "Out of date person or thing" , "Huge beast" , "is well out of date" .)

I've seen this clue in The Guardian.
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