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

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