Crossword Genius

Confirm, guarantee (7)

Ross

I believe the answer is:

certify

I believe this is a double definition.

'confirm' is the first definition.
(thesaurus)

'guarantee' is the second definition.
(certifying is a kind of guaranteeing)

(Other definitions for certify that I've seen before include "Authorise officially" , "Declare; endorse" , "Formally confirm" .)

I've seen this clue in the Sydney Morning Herald.
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