Possible Clues:

• Cousin of un
• The god Pluto
• Affront, in street slang
• Not 85-Down
• Be rude to little man on the way up
• Underworld criminal to catch up with chap that's unhappy over here after vacation down under
• Belittle, in slang
• Hannah Montana's channel, in TV listings
• Prefix with like or ability
• Criticize harshly