Possible Clues:

• Had too much, of course
• Taken too much as a matter of course
• 'Had too much, of course, over EX, perhaps (9)'
• If one sounded like the headmaster of a public school, one might have had too much of it, of course
• How one might have had too much of 15 across
• Vere! An X means you've taken too much, of course
• Throughout, school reported what Bunter had done
• With a tree chopped up in the oven one has had too much of it
• Scoffed too much regarding school report
• English tear violently into cooker, becoming gorged