@dramypsyd Not so brilliant. The response will be: "Ah. I understand. Thank you for coming in."
There is no legal requirement that anyone hire you because you refuse to answer a very ordinary interview question.
And if your other answer is: "It's classified." That's also silly. Lots of people have varying levels of classified access and still have a verifiable job title, workplace, and HR department. If you're an actual spy, the gov provides a searchable cover employment history.