Possible Clues:

• Dined in college by the sound of it
• Had ex, perhaps, as a matter of course
• Made a meal of an E with an X
• Returning thanks in the evening, having enjoyed dinner?
• School, they say, is to be demolished, possibly
• Moth or worm follower
• Word with ''worm'' or ''moth''
• No longer in the dish
• Corroded (with ''away'')
• Like courses finished in college, we hear