Tennis or bridge achievement? (4)

I believe the answer is:

slam

(Other definitions for slam that I've seen before include "big contract" , "what needs a lot of tricks to succeed" , "Ambitious contract" , "Shut loudly and forcibly" , "Shut hard" .)

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.