Possible Clues:

• Large bay
• College getting a series of letters from instructor, ie lecturer
• Engineers regularly dispersing tanker's cargo in bay
• One could look through this for place to study at Oxford
• College could be holier without its head
• Window built out from upper floor
• Name of college that's offered for answer in exam
• College lecturer backs Conservatives, after removal of extremists
• Oxford college - window
• One in role of the window to make it bay