Possible Clues:

• King stays in land that's safe
• Acceptable
• It'll be - - on the Night, TV comedy
• Some grammarians say it's all wrong
• Land encompassing river? Certainly!
• Land around river is acceptable
• "The Kids Are __": 1979 The Who documentary
• River going through land very well, as some would put it
• The Who's 'The Kids Are —'
• 'It'll be -- on the Night', TV comedy