L was fired from my last employer for being late, is this going to prevent me from getting clerance?

well we know sometimes it can't be helped but if it keeps happening it could cause issues with any job the boss does evaluations and it could come up on your evaluation now sometimes if its a good reason the boss will over look the circumstance but the boss can either let it go cause he knows the reason for it or write you up and if it isn't a recognized reason they can get tired of it and let you go mabe a good reason to look at the guidelines for it in the employee hand book it might be a problem depending on the boss or owner and how they look at it over all