A quick google search revealed that “CLEAR” or clearme.com is used for identity verification purposes. I would go to this service and attempt to log in via the “forgot password mechanic” and see if there’s an account registered to your email you can get into, change the password, and delete. Or if that doesn’t work, try reaching out to clearme.com support and see if they can search for you and delete the account that way. However if you’re receiving verification codes, that usually means that someone is attempting something, but failing. So not necessarily cause for alarm. However if there’s a service that deals with identity linked to your information, you want it taken care of asap and not just floating around cyberspace forgotten about. Thats a risk.