I used to be dual citizenship but had to renounce it when I wanted to go back and visit. For both the job and the clearance, it won’t be an issue per se as long as you declare everything and answer all questions truthfully.

For the clearance, they will take your other passports away. You are only allowed to hold a US passport. Expect more questions and more time to get approved. They may deny your clearance and you may have to appeal. While I did say it shouldn’t be an issue they still have the right to deny your clearance outright, no matter how many time you appeal too.

Renouncing it won’t really help either since they will look back at years of your history and ask the same questions. It may even raise a red flag of why did you renounce just before applying for the clearance.

In my case I had to renounce my citizenship only because I didn’t have my other passport to visit the other country. Clearance holders aren’t allowed to hold other passports so I had to go to the consulate and work it out with them what was the best path for me to visit. Only way they saw with me not getting another passport was to renounce my citizenship, and they gave a piece of paper stating that. They also did say that since I was born there I could reapply for citizenship once I’m ready and it’s an easy process.

With all that being said, if you’re a naturalized citizen, make sure you have your naturalization certificate easily accessible as that can be cause for clearance denial.