Possible Clues:

• Get stuffed and how
• Stuff found in Grieg or Gershwin?
• Deep, natural crevice
• Glut from plant that's good for son
• Blood is full of good stuff
• Try anything, initially, to escape storm in valley
• Man dropping ecstasy in The Canyon
• Locale for a rock climber
• Pass stuff
• Deep valley passing through Luxembourg or Germany