Get your Clarinet repaired!
Does your clarinet look like this? I hope not! But even if you just need a minor repair, get it done! You will play your best on an instrument that is working properly.
When a key is out of alignment we often compensate by pressing the key too hard, using the wrong fingering, or over-blowing to get the note out. This will surely create bad habits!
So, get your clarinet repaired!
It's very important to go to an experienced repair person who knows how to PLAY the clarinet as well as repair it. Instrument repair should only be done by someone who is properly trained.
For qualified repair people, if you are in the Sharon, MA area I recommend Joe Saravo at Music and Arts in Walpole. If you are in the Concord, MA area I recommend Leonard's Music in Bedford.