Related Clues:

• Fastened as in S.W.A.L.K.
• Leased in secured state
• Secured against leakage
• Closed up, watertight
• Closed tightly, maybe with wax
• Might the dog do the wrong thing in a row?
• Thus it may get close
• Close to the South you get to 21 down
• How, perhaps, the water rose till it got stuck
• This is close
• Stuck down
• Close with it
• O, that does not go over the pen
• Open's partner
• Sealed tight