Clendening, 22, was selected by Chicago in the second round of the 2011 draft and made his NHL debut in November. He had a goal and an assist in four games before he was sent down to Rockford of the American Hockey League.
The Canucks sent 18-year-old defenseman Gustav Forsling to the Blackhawks to complete the deal. Forsling has three goals and two assists in 35 regular-season games with Linkoping of the Swedish Hockey League.
Forsling was a fifth-round pick in last year's draft. Blackhawks general manager Stan Bowman says Forsling is ''an offensive defenseman that plays very well on the power play and has a big shot.''
The trade was announced on Thursday night.