Possible Clues:

• Alan's confused, and just about knows it, by the sound of it
• Alan's terribly nosy
• Sound heard in 'as thin as a lath'
• Some passages
• By the way one knows, by the sound of it to get sent, by the sound of it
• Sounds as if one knows of this, on the face of it
• One knows like this the sound of it
• US space agency procures large rhino
• To do with nose, say sound
• Whiny-sounding