Possible Clues:

• Headgear (of the working class?)
• Spooner's pet's entry to working-class symbol
• Agreement great king casually rejected — on northerner's head be it?
• Something for a Yorkshireman opening for Spooner?
• Spooner's contrivance to give Tom admission as working-class symbol
• Better put on boring headgear
• Act up in agitation characteristic of the working class?
• Even better item for the head
• Panic about a court reversing working-class symbol
• Short-brimmed hat known as a bunnet in Scotland