Guess: Abbr (3)

I believe the answer is:

est

(Other definitions for est that I've seen before include "self-improvement programme" , "psychological programme" , "Time Americans adopted" , "Suffix showing superlative" .)

I've seen this clue in the Universal and the New York Times.

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.