Possible Clues:

• Sudden desire to have simple reform around University
• See 111 Across
• On-the-spot, as a purchase
• With 63-Across, Freudian concept of resisting temptation ... or a hint to four squares in this puzzle
• Thrust
• Urge two universities to support Independent politician
• Spontaneous desire
• Sudden feeling got from flying miles up
• Urge simple changes around uranium
• One million beats perhaps creating sudden urge