Make certain (6)

I think it could be either:

ensure

assure

'make certain' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for ensure that I've seen before include "Make certain, clinch" , "Make certain for the future" , "Make certain or safe" , "warrant" , "Make certain that (something occurs)" .)

I've seen this clue in The Irish Times, the USA Today, The Mirror, the Penny Press, the Newsday, the Sydney Morning Herald, The Star Tribune, The Wall Street Journal, The Times, The New York Times, The Telegraph, The Independent and 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.