By Ewan Murray Arsenal had to come from behind to secure a nervy 3-1 win over Southampton at the Emirates Stadium in the Premier League. The Gunners couldn’t make a first-half breakthrough and fell behind shortly after the restart following Cameron Archer’s well-struck effort. But the home side responded swiftly and goals from Kai Havertz, Gabriel Martinelli and Bukayo Saka secured a vital win. The result keeps Arsenal within a single point of table-toppers Liverpool heading into the international break, but Southampton still sit in the relegation zone as they await their first league win of t…