Possible Clues:

• Hairless white caterpillar
• Productive caterpillar
• Fibre-making caterpillar
• It's a caterpillar
• Caterpillar: type found in southwest or Middlesex, principally
• Small class, without room to display little creature in fine case
• Boss milks row with one of those cocooning, in the material sense
• Despicable type under QC is producer of material
• Spinner given material spinning line on motorway
• Milks row, working for 20