Witness’s pledge in court (4)

I believe the answer is:

oath

(Other definitions for oath that I've seen before include "Curse or solemn word" , "in court, we take it" , "bad language" , "A curse or a vow" , "word intended?" .)

I've seen this clue in The 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.