Possible Clues:

• An account to believe and show to be true
• Cat cried (anag.)
• Grant credentials to a school
• One might ascribe this to what 5 down might like to get, by the sound of it
• It built up at first without university's guarantee
• Give official sanction to (a diplomat)
• Officially recognise
• Recognise Bill has surplus wealth
• Judge as qualified
• Certify account — and believe