Related Clues:

• 'Ultimate' degree
• Nix from Nixon, once
• "Ultimate" degree
• Investigate old block
• To
• High degree, in math
• Mathematician's unnamed ordinal
• Ban casting vote
• Extreme utmost degree
• Controversial line-item action
• Word on a big red stamp that I imagine the president owns
• Umpteenth
• 'I forbid,' to Caesar
• Advanced degree in math?
• Nix from the president, e.g