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 assure that I've seen before include "Cover by life insurance" , "Impart confidence" , "Guarantee, promise" , "Convince, guarantee" , "Convince, satisfy" .)

I've seen this clue in The New York Times, The Telegraph, the Penny Press, the Sydney Morning Herald, The Mirror, the Newsday, The Star Tribune, The Times, The Independent, the USA Today, The Guardian and The Wall Street Journal.

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