Related Clues:

• A tree; a stopper
• Stopper, Irish city
• It stops either end of crack?
• Buoyant bark in port
• It's needed for a bottle of wine or port
• Type of bark; seal
• Plug for a bottle
• Why wine can't be accessed, or port
• Introduction of safety cap for each plug
• Irish county; stopper
• Stopper; Irish city
• Wine bottle feature
• It's south of Limerick
• Plug organised sport, including fitness training
• It's causing a hold-up in some bottle-neck