Related Clues:

• It's gas not being able to escape drunk, on a plane?
• In appearance too small to be unassailable
• Tense under strain and impermeable
• Exhibit plastered and completely sealed
• Mixture of gases hazardous — could be sealed
• Jars may be drunk after broadcast
• Hermetically sealed
• (Of a defence) having no weaknesses
• Beyond question it's a tune for local drunk
• Beyond question, tune associated with local drunk
• Beyond question, it's a tune for local drunk
• Leak-proof boat's ultimate in first class privilege
• Publicise compact, securely sealed
• Look mean, not letting out a breath?
• Not allowing gas to pass