Crossword Genius

Very large dinosaur (12)

Ross

I believe the answer is:

brontosaurus

(Other definitions for brontosaurus that I've seen before include "Prehistoric beast (thunder lizard)" , "Huge herbivorous Jurassic reptile" , "Prehistoric thunderer?" , "Large herbivorous dinosaur" , "Dinosaur with a long neck and tail" .)

I've seen this clue in The Mirror.
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