Possible Clues:

• Light fixture on a wall
• Light on one who was formerly at the Bar?
• Formerly at the Bar, but you can carry it off lightly
• Ornamental wall-bracket for candle or light
• Student challenge to wit at one time
• Candleholder - head - mug - fortification
• Formerly at the Bar, now making light of it
• A candlestick is fine at university
• Candle bracket - earthwork - head
• Make light of the S.C.?