Related Clues:

• I've no idea (informal)
• "I haven't the faintest idea"
• Kind to yield immediately? Not sure!
• What a shrug may mean
• Ordered own kind to profess ignorance
• Pass horse, on climbing
• Musical performance around November 5th in calendar? Beats me
• Negative response to "Anyone have the answer?"
• Pass on painting that's cut up
• "Not sure ..."