Possible Clues:

• Like mozzarella
• Fibrous
• Thin bit of rope held tight? On the contrary
• Forming viscous or glutinous threads
• Tough taking jewellery put in the pen
• (Of food) tough, fibrous
• Old bean is so mean - that's about right
• Mean to eat roast, initially hard to chew
• Tall, wiry, thin and mean? About right
• Like some pot roast