Possible Clues:

• Paper mark that identifies the common people
• Vermin tangled on a horse leads to disreputable group
• A scrap with a label needs 22 across for the rabble
• Badly organised student event before term
• Bob follows such common folk with a tail
• Disorganised student fundraising volunteers failing finally
• What a common way to go with a tail on Bob
• For the common folk, up with the firearm for the fish
• The tale of a bob, by the sound of it, is commonly said to follow it
• Disparaging term for the common people