Afobe gunned down the League One champions to keep alive Huddersfield’s slim hopes of snatching the second automatic promotion spot from Southampton.
Striker Afobe, on loan from Arsenal, scored twice and set up a last-minute winner for substitute Danny Ward as the Seagulls’ trophy celebrations in their last ever game at Withdean fell flat.
Clark said: “It was another fantastic performance from Benik. His first goal was top class. The second highlighted how quickly the boy can react.”