Possible Clues:

• Diploma word meaning "great"
• Great, on some diplomas
• Ars ___ (anagram of 'anagrams,' aptly)
• The first recognition in English law that subjects of the crown had rights
• Agreement commemorated in 2015 revised as act (anagram)
• Word on a distinguished grad's diploma
• Great, in academic distinctions
• The ___ Carta
• ___ cum laude (with great distinction)
• --- cum laude