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

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