Possible Clues:

• Pasture ultimately silent, as ground needed
• Vitally important
• Directed to enter crackers aisle for must-have item
• German city starts to treat immigrants as legally required
• Key
• Something vital from German city -- it's picked up by almost everyone
• Head off in temper — it's over a lost key
• European steals in, after forging key
• Wrought steel is an absolute requirement
• Important German city Italy almost rebuilt