Possible Clues:

• Indispensable to Wilson's Shakespeare
• Very important source of energy on windy piece of land in Loch Ness
• Key German city, one captured by British soldiers at length
• Key turned as let in after entrances cleared
• Sees new Latin translation as something necessary
• Extremely important it comes back between German city and Alabama
• Innate lateness I displayed
• Type of oil obtained for key?
• Indispensible
• Like many nutrients