Authenticate, as opposed to issue (8)
I believe the answer is:
notarise
'authenticate' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for notarise that I've seen before include "Witness official documents" , "establish an official record" , "Authenticate" , "Officially attest" , "Establish truth" .)