Herbivorous dinosaur of Jurassic and early Cretaceous times with an armour of bony plates (9)

I believe the answer is:

stegosaur

(Other definitions for stegosaur that I've seen before include "Armoured fossil creature" , "old dinosaur" , "Jurassic creature" , "prehistoric creature" , "Old veggie" .)

I've seen this clue in The Mirror.

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