I keep having to clear my voice when I'm at work. What can I do to make my voice clearer without having to clear it?

Treat allergies. Mainstream: zyrtec or Claritin (loratadine) in am; eliminate dust, dust mites and smoke from work environment. A hepa air filter will help alternative: essential oils of peppermint breathed from hands i find to very effective as well.
Treat acid reflux. Do you drink a lot of coffee at work? A glass of wine at night? These can cause acid reflux. Throat clearing is a classic symptom. You probably don't have any heartburn.
You may have. allergies; however you should also be checked for GERD- acid reflux which can also cause voice issues. I also suggest an ENT evaluation and visulaization of your vocal cords.