Possible Clues:

• Soldering irons start making electronic device
• Semiconductor device
• Radio One banned from schools? Unseemly riots will ensue
• Old type of radio
• Radio star is torn, in other words
• Electronic device shows movement across south by soldiers
• Made train ring head signalman to sort out old sound system
• Electronic component
• Representing first of rap artists on radio
• Radio station's broadcast about reading — and writing?