Possible Clues:

• Conductors join on return journey that's cut short
• The West's triumph begins with experts
• Superconductors?
• Admired practitioners who beat the established time
• Conductors taken from trams, i.e. replaced
• First parts of Radio Times upset leading musicians
• 15-Across and others
• Conductors returned at front, inspecting rail tickets before junction
• Excellent conductors
• A mister, extraordinary, may be in this group?