Kvistgaarden was his replacement and soon fired a left-foot effort into the net from Kenny McLean’s perfectly-weighted through ball, but he had started his run fractionally early and it was ruled offside.
The Dane was not to be denied, however, and after Seny Dieng kept out Ali Ahmed’s point-blank effort following a good move down the right, Kvistgaarden headed the loose ball against the bar before finally nodding the rebound over the line.
If that was a scruffy finish, the second was pure quality as Maghoma created space for himself with a slick turn and beat Dieng with a low shot into the net, before curling just beyond the far post from another opportunity moments later.
Wednesday stirred themselves after the break and Jamal Lowe fed Charlie McNeill on the right of the box but a superb diving block by Kellen Fisher deflected his shot just wide of the target.
Dieng palmed away a fierce 25-yarder from Jacob Wright as Norwich resumed normal service before Clement sprang a surprise by taking off Kvistgaarden and sending on Jakov Medic, normally a centre-back, to lead the line up front.
The Croatian may not have the nimblest feet but offered a physical presence and a focal point as the Canaries looked for a third, but regular substitutions disrupted the flow and it was Wednesday who came closest when Joe Emery headed wide from a free-kick when he should have done better.
They will be at home to Southampton on Saturday, with Norwich travelling to take on Leicester City.
