Possible Clues:

• Requiring special knowledge to be understood
• Requiring specialist knowledge
• Scientific investigator smashed china and left
• Specialist caught in China let off
• Specialised sleuth given bit of change in USA, we hear
• Unravel catch line, using a specialised skill
• Catch line that's knotted with a sort of hitch
• Relating to mechanical art or applied science
• Specialised new ICT can help after loss of power
• Concerned with applied science