Finest of its kind (8)

I believe the answer is:

ultimate

(Other definitions for ultimate that I've seen before include "Happening at the end of a process, final" , "Best - last" , "Utmost or extreme" , "Furthest, final" , "Final or absolute" .)

I've seen this clue in The Guardian.

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.