Suffix with count or baron (3)

I believe the answer is:

ess

(Other definitions for ess that I've seen before include "top secret" , "One next to tee" , "Curvaceous letter" , "Nineteenth letter" , "Letter from Mid-West" .)

I've seen this clue in The Wall Street Journal.

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.