Great pick for you guys. I had him #1 on my list this year.
I think he's the most naturally talented of all the players in this draft. He's a dynamic offensive talent. Incredible hockey sense, playmaking, and puck skills. His shot can use some work, but isn't terrible. His skating plays as effective. It gets criticized a lot. Some call him knock-kneed. It's unconventional, but I have yet to see it play in games as anything worse than average, and it actually looks better than average to me. Defensively, I think he's pretty good. I wouldn't consider him a shutdown defenseman, but he has size, makes good decisions out of possession, and should eventually have the weight to battle physically in the tough areas you expect of an all situations defenseman. He also has been incredibly productive everywhere he's played his whole career.
I don't think there's a great comparable for this guy. Some say Adam Fox, but I see some differences. Clarke is bigger, while Fox hockey sense is not something you can compare a prospect's hockey sense to. I think John Klingberg is the best comparison out there for style of play and a likely outcome, but even that comparison isn't great. I think Clarke will be better than Klingberg.