definition of clayton antitrust act
DEFINITION of 'Clayton Antitrust Act'. An amendment passed by the U.S. Congress in 1914 that provides further clarification and substance to the Sherman Antitrust Act of 1890. The Clayton Antitrust Act attempts to prohibit certain actions that lead to anti-competitiveness.Next Up.he Clayton Antitrust Act provides barriers to a broad range of anti-competitiveness issues.