Rory McIlroy has revealed his “clear head” after stepping away from golf politics has been key to his personal happiness - and his Grand Slam glory. The world No.2 will this week bid to crown his memorable year by retaining the DP World Tour Championships and winning a seventh Race to Dubai. The Ulsterman, 36, won the Masters in April, his Irish Open in a playoff in July and then led Europe to an away Ryder Cup win. Speaking before the final event of the season, the Ulsterman was asked if this