Authenticate (5)

I think it could be either:

Which length description are you looking for?:

prove

'authenticate' is the definition.
(I know that authenticate is a more specific form of attest)

This is all the clue.

(Other definitions for prove that I've seen before include "Verify" , "Show to be true" , "Demonstrate (truth)" , "Demonstrate to be true" , "Ascertain" .)

I've seen this clue in the Penny Press.

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