Just OK, in slang (3)

I believe the answer is:

mid

(Other definitions for mid that I've seen before include "Prefix meaning centre" , "Denote the centre point" , "Of the central part" , "Dim sort of prefix" .)

I've seen this clue in the USA Today and the Universal.

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.