Definite, certain (4)

I believe the answer is:

sure

I believe this is a double definition.

'definite' is the first definition.
(synonyms)

'certain' is the second definition.
(synonyms)

(Other definitions for sure that I've seen before include "stable" , "Definite" , "Certain to be a ruse" , "Agreed" , "Positive" .)

I've seen this clue in The Times.

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