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

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