This work discusses clearing policy used by a specialist agent on marketing strategies under the rules of TAC CAT agents International Tournament. The goal of this agent is to create a market and then establish a set of policies for controlling agents' behavior of other agents interested in trade with him. This agent must be able to establish accepting, prices, charging and clearing. Clearing policy determines how and when to clear the market, that is, how to match accepted shouts, and when to perform transactions over already matched shouts. A clearing policy implementation is proposed and the impact of it over number of matched shouts, number of transactions and traders attracted during a CAT game simulation is analyzed.