It can be broader than above.
The two replies above sound like ways to write a non compete clause. What you are asking about is different.
It could be to the effect of that you will only practice clinical medicine for the entity you are signing the contract with. This could come as a clause saying any payments you receive for clinical services are owed to your employer.
There’s no magic word to look for. You have to read and understand everything and/or hire a lawyer who can review it for you.