Ultimate attainment (4)

I believe the answer is:

acme

(Other definitions for acme that I've seen before include "Pinnacle" , "Highest point of excellence or achievement" , "Point of maximum development" , "Summit - maximum" , "Top or highest point" .)

I've seen this clue in the Newsday and the Newsday.com.

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.