Possible Clues:

• It could be an off one
• Artificial fly quietly pinched by trespasser
• I make deliveries turning South to Middlesex town
• A revolutionary, but at last not on the outside
• Bowler - fisherman's fly
• The revolutionary is not out at last
• The postscript turns round over the inside part at the bottom
• Bowler from South London borough
• Top government spokesman?
• Part of many board games