What is a brokerage policy?

Perhaps you mean a "brokered" policy? This means that your agent has quoted your policy through a middle-man or "broker" that goes directly to the company. There are usually additional charges or fees involved with brokered policies. Finding an agent that can secure a quote directly from a standard company is one way to avoid this charge. Depending on the type of business, a brokered policy may be your only option.