Here are some options you could use, depending on the context:
* A firm of solicitors - This is the most common and straightforward way to refer to a group of solicitors.
* A panel of solicitors - This suggests a group of solicitors chosen for a specific purpose or task.
* A bar of solicitors - This is less common, but could be used to refer to a group of solicitors who are all members of the same legal profession.
Ultimately, the best option will depend on the specific situation.