Possible Clues:

• We hear group of countries support barrier
• Trade barrier
• Report of alliance funding siege
• Cuban Missile Crisis tactic
• Cut off as required, keeping curled hair
• Cutting edge round old empty cask causes closure
• Siege ordered to capture part of canal
• Prevent use of jam with permanent mark on tablecloth there for good
• No getting through this hamper - it's made off the top of one's head
• Obstruction