Possible Clues:

• Sport, one a few find boring
• “To be in company, even with the best, is soon ____ and dissipating” (Thoreau)
• Yawn-inducing
• Tedious first person among royals is entering a capital
• Dull clothes is in for some East Enders
• A few overcome by river current, like a bore?
• Tedious, tiring
• Boring sport, one followed by a few
• Tiring, I saw more failing with low grade
• Hard work initially, easier otherwise to maintain order