Related Clues:

• Not a grade to be proud of
• Scottish river known for its salmon fishing
• D
• See 58-Across
• Balmoral Castle’s river
• Grand finale?
• Land's end
• Actor Billy ___ Williams
• Not-so-hot grade
• Actress Sandra
• End of the world?
• Home to Scottish salmon
• Pee ___, Carolina river
• Door opener?
• Singer Kiki