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

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