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 Sydney Morning Herald, The Mirror, the USA Today, The Star Tribune, the Newsday, The Irish Times, the Penny Press, The Independent, The Guardian, The Telegraph, The New York Times, The Wall Street Journal and The Times.

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