Related Clues:

• Spirit
• See 50-Across
• Basic Halloween costume
• Shade
• See 44-Across
• Specter
• Apparition
• Straub's ''--- Story''
• Doppelgänger
• Mere semblance
• Hamlet's father, e.g.
• Certain transparency
• Faint trace
• Write for another
• That's the spirit!