Possible Clues:

• Decay of body tissue for want of blood supply
• Frenchman supporting band gets necrosis [5,1,8]
• Corruption results when the Frenchman joins the mob
• Decay of body tissue from lack of blood
• Frenchman joining working party? What rot!
• The crooks ne'er got confused with such mortification
• Corruption with criminal bunch ne'er reforming
• Tissue decay resulting from disease, injury etc
• Localised death of living cells
• Necrotic tissue