Possible Clues:

• Bit of dope monitoring unit at first trace coming north
• It's given to Father to be wide round the middle
• Single informative fact
• Mother has organised workers in fact
• Starts off dry and turns unusually mild, in fact
• On reflection micron's a tiny amount, in fact
• Thug regularly sheltered by mother — a little dope?
• Obstruction over trade union ¿ that's a fact
• Piece of information union used in current stoppage
• Churned up mud at starting line