Clarke was pleased with the immediate impact made by Sessegnon, who refused to celebrate his goal.
He said: "He did what we brought him here to do. He is clever on the ball, he is bright, he is an entertainer.
"He has got some goals in him as well, so a pleasing debut for him.
"I think he showed respect to Sunderland. The fans liked him and loved him as a player.
"He is quite an engaging character and he chose not to celebrate. That's fine. If he wants us to celebrate more than him I'm happy with that."