Possible Clues:

• Something teachers often dislike about film publicity
• Plugs damage beer barrel with metal inside
• Promoting after-hours activity of teachers around Eton — not on
• Grant Mike dubious promotion
• Stripe on a zebra, e.g
• Promoting and selling (goods or services)
• Teacher's task is to comprehend alien business function
• Sales require boy to get in difficulty
• Commercial process given assessment, say, when money comes in
• Brand, say, written on outside of can for goods exchange