Possible Clues:

• On balance, tends to look down on the clowns
• Highly strung, one whose life may be in the balance
• One who may work without a net
• Performer offering a balanced performance, although high
• One guy won't support this one
• Telegraph work? It involved being on wire
• Performer up high with good balance
• Performer balancing on a thin cable
• Drunk guy maybe, pedestrian performer who looks about to drop off?
• 'Telegraph' work -- it involved high-level performer