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

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