Possible Clues:

• Lone wolf from Route 51
• One detached from main grouping
• Suburbanite's spoken dismissal of pork-pie retailer?
• Working to rule, I will be an isolated person
• To rule, I will not be at home
• Detached portion of rock from Route 51, possibly? (7) {3,5}
• Anomalous data point
• Statistical anomaly
• Result is so unusual, just three seconds short — it may be this
• Expose fraudster, we hear, one in extreme position