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

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