Possible Clues:

• Bones, not leeks, cooked
• Small keen lot travelling to the National History Museum exhibit
• Kneels excited over bone from duck found in archaeological site
• Chopped leeks and no meat
• Halloween costume
• Framework that's minimal, somehow not sleek
• Type of key or crew
• It's made of chopped leeks by the ton with bones
• Closet item, so to speak
• Basic scheme of English embraced by poet