Vouch for (6)

I think it could be either:

Which length description are you looking for?:

6,2

attest

'vouch for' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for attest that I've seen before include "Demonstrate" , "University town" , "Give proof" , "Corroborate" , "Affirm by oath" .)

I've seen this clue in The Star Tribune.

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