By Foo Yun Chee BRUSSELS (Reuters) -Parker-Hannifin is set to gain EU antitrust clearance for its 6.3 billion pound ($8.3 billion) bid for Britain’s Meggitt after offering to sell a U.S. factory to address competition concerns, people familiar with the matter said. The U.S. engineering and aerospace group submitted its offer to the European Commission last month and the EU competition watchdog then sought feedback from rivals and customers. Britain is probing the transaction, the latest by a U.S. buyer of a British firm, over national security concerns as Meggitt’s customers include Boeing, Ai…