Possible Clues:

• Discipline that's like a joke, by the sound of it
• Encourage guards in upping discipline
• Give a time-out, say
• Shout "Go to your room!"
• Say "No TV for a week" to, perhaps
• Maybe fine joke is hilarious at first
• Verb related to ''penalty''
• Come down on press, receiving popular backing
• Like a play on words lacking core discipline
• Drive round Northern Ireland is fine, perhaps