Maddison directed a 'shush' celebration towards Roy Keane after his goal and Postecoglou was also able to silence critics who have slammed his tactics in recent weeks.
Spurs benefitted from players returning from injury, including Maddison, while United's teenage bench left boss Ruben Amorim deprived of options.
TOTTENHAM clung on to beat Manchester United and kept a rare clean sheet to ease pressure on Ange Postecoglou.
The visitors missed several chances to equalise as James Maddison's early opener separated the sides.
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