Possible Clues:

• Agreement
• Confederation
• State of the ___
• College certainly not over for some workers
• Something nasty afoot has leader deserting alliance
• Mathematical set comprising all the elements of two or more others
• "... in order to form a more perfect ___ ..."
• 11 for the __; Sunak's other job title
• Gabrielle of "L.A.'s Finest"
• Place to learn about a kind of rugby