Possible Clues:

• Large unit of resistance
• Unit of electrical resistance
• For Constantine I, entering my home oddly generates a lot of resistance
• Margaret with expression of surprise — maiden showing a lot of resistance
• Frenchmen embrace Freud's concept and second theory offering a lot more of what's in 17 across
• Resistor unit
• Insulation tester's unit
• A lot of resistance
• Rebuilt home good inside? Initially met a lot of resistance