Possible Clues:

• Match a cup like this for a fish at first at last
• With 16-Across, term climax
• Last decoration on roof I removed
• This has a cup to match
• Not subject to any more changes
• Last in a series of games or contests
• Most important class exam
• Alf is confused about in this at last
• "And that's ___!"
• Set in concrete, so to speak