Related Clues:

• Securely closed
• See 2 Down
• Open-and-___ case
• Completely closed
• Sealed, say
• Not even cracked
• Securely sealed
• Thus it may get close
• Close to the South you get to 21 down
• This is close
• Close with it
• O, that does not go over the pen
• Open's partner
• Sealed tight
• See 9