Possible Clues:

• Fine fabric found in transport leaving Cumbrian town
• Strong fine cotton thread or fabric
• It's just a yarn that it's an island at last
• For this material, student is getting lecture
• The thread at last is a little in the water
• Man after line is stocking thread
• Anthem composer suggests twisted yarn
• Large place surrounded by water is fine for making hosiery
• Yarn from Cornwall is legendary
• Twisted cotton yarn