Related Clues:

• Make waves?
• Lincoln center?
• Singer Joey with the 60's Starliters
• Bee chaser?
• Just-passing grade
• Low grade
• River to the North Sea
• Not a grade to be proud of
• Issue
• Scottish river known for its salmon fishing
• D
• Project
• See 58-Across
• C
• Balmoral Castle’s river