"To hire an agent" means to employ someone to represent or act on your behalf, typically in business or professional matters.
Sentences with «to hire an agent»
Don't hire an agent who doesn't have your best interest at heart. (thebalance.com)
If you don't have a networking contact who can introduce you to the acquisition personnel at publishers, then you may want to explore the possibility of hiring an agent to represent you. (toughnickel.com)
The option of being able to hire an agent for a flat fee feels reassuring to me, too. (annerallen.com)