By Jude Summerfield Newcastle’s 4-0 thrashing of Tottenham on Saturday triggered a clause which will see on-loan Chelsea player Lewis Hall join the club permanently in the summer transfer window. The Magpies surged to victory at St James’ Park with Alexander Isak leading the way up front as Eddie Howe’s side lifted themselves above Manchester United into sixth. Hall was signed on loan from west London with an obligation to make the move permanent should specific thresholds be met and their latest win has ticked off a mandatory clause. It’s now reported that the clause was based around Newcastl…