Dinosaur with a "WALL-E" cameo (3)

I believe the answer is:

rex

(Other definitions for rex that I've seen before include "King's title" , "Part of official title of a king" , "One in the palace" , "See 6" , "Dog's name; king" .)

I've seen this clue in the Newsday.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.