Possible Clues:

• Seal, as a packing crate
• Affix, as on a wall
• Seal, as a shipping crate
• A lupin (anag.)
• Close tightly, in a way
• Crucify, perhaps as represented in Paul
• Close tightly, as a crate
• Lian to fasten
• Lian, perhaps, might be the way to keep one down