Make certain (6)

I think it could be either:

ensure

assure

'make certain' is the definition.
(synonyms)

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

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