Possible Clues:

• It doesn't require any consideration - O'Brien ran away
• "Duh!" evoker
• Number in bar tipsy with little hesitation? It needs minimal thinking
• Simple decision to redesign bar in Reno
• Easy task
• Robin near to transfer of mindless task
• It's totally clear with head above cloud?
• VIP has to fall down before monarch, that's an obvious thing
• Peer and monarch about to fall for very easy clue?
• Piece of cake airborne, thrown after knight