Possible Clues:

• Act hoity-toity
• Act all hoity-toity
• Affect superiority
• Make fun of tunes?
• Act superior
• Maybe 'ave a graft on top to try and be posh?
• DJ might be affected so
• Crazy Rasputin, hanging around Nicholas's inner circle to act superior
• What pretentious DJ might do?
• A deejay might assume a haughty manner