Possible Clues:

• It's settled, nothing more to be said
• A truism - there's no more to be said
• It's settled, nothing more to be said or done
• Phrase of finality
• ''It's over and done with!''
• "So ___"
• It's concluded a statement of the obvious
• There is nothing more to say about the Yorkshire headgear going twice round square
• 'Nothing more to it'
• Extremely thorough moreover checking seconds - there's nothing more to be done