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

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