"You are the best thing that's ever been ___" (4)

I believe the answer is:

mine

(Other definitions for mine that I've seen before include "Source of ore belongs to me" , "The pit belongs to me" , "Rich source" , "Explosive device concealed in ground" , "Excavate for minerals" .)

I've seen this clue in the USA Today.

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.