Possible Clues:

• 'Copy that'
• Just one of the hacks becoming famous?
• Well-known college rejected daughter
• Don't get well known around the East
• The famous way in which IOUs can never be tedious
• There isn't a famous boy here
• Marked absence of favourite toy
• Observed college is backed by deputy head
• Saw, or celebrated
• You'll remember that's no end of a 20 down