Possible Clues:

• Conductor used to make contact with non-metallic part of circuit
• Terminal of, eg, an acid battery
• Only those currently chosen were mounted
• A lightning-conductor?
• Perhaps went by bus under chosen conductor
• Only the chosen currently were mounted (9)
• Conductor's chosen stick, eager to start
• Conductor to choose passage we hear
• Conductor is to choose the route, we hear
• Conductor designate went by bike