Can a logic hook invoke admin rights?

The Assigned To field in our clients module is set to Read Only for the sales agent role because we don't want the agents to be able to change that field at all.  What I need to do is find a way during the creation of a new client to run a hook - or part of a hook - as the admin user to set the Assigned To field to the agent creating the new client.  Is this possible?

Thanks.

Jason