Possible Clues:

• A current entitlement to keep top of this sealed
• Tense under strain and impermeable
• Not allowing gas to pass
• Exhibit plastered and completely sealed
• Like some alibis?
• It's gas not being able to escape drunk, on a plane?
• Result finally seen in excellent side without any weak points
• Broadcast hammered — that's beyond dispute
• Broadcast drunk? Beyond question
• Sealed off main road just outside entrance to town