Possible Clues:

• Wipe out
• Old bishop is well-read in Kill
• Utterly destroy
• Destroy old book, well-read
• Blot out well-read former pupil taking the lead
• Remove traces of oil -- a better fluid
• Lob with spin to go over the same ground and cause destruction
• Pupil who was able to spell 'efface'
• Remove all traces of oil with a better process
• Having died, learned to strike out