Batman tells you right off what you need to do to defeat Clayface. Throw ice bombs at him. Hit RT/R2 twice to through one. Just keep tossing them at him and avoiding his attacks. He has a few attacks but they are painfully obvious when they are coming. He has a blade attack that is in close on the first swing and covers almost the entire area on the second. He also has a Hammer attack where he can squash you, an overhead leap that can cover the entire room, and an overhead swing that you can either dodge or use counter to dodge (you'll see the regular indicator above his head during this). He has one other attack where he turns into a ball which can be kind of hard to avoid if you're close to him so it's a good idea to keep your distance.

So you'll dodge a lot. In between dodging you should just be hammering him with grenades. Eventually his life bar will run out and he'll be frozen. Go beat on him a little bit. Eventually, he'll thaw and he'll return to his attacks. He will be more aggressive and take less damage than before but he's only got one new attack this time. He will spin around and shoot little pieces of clay at your feet. Just keep dodging this and repeat what you did last time.

Phase 3 is entirely different than the first two. Rather than fight clayface directly, you'll fight little clay creatures. You'll also notice two bars in the upper right. The orange bars are the creatures you're fighting. Once that disappears, Clayface will appear from the giant puddle of clay. You need to throw freeze blasts into his mouth. If you don't get it the first time, it will slow him down giving you a much easier time at getting it in his mouth the second time. This will lower the blue bar. But the more damage that you do to Clayface, the more minions he will send at you.

The real tough part here is that the minions have an incredible reach so you need to be very attentive to countering. It may even by wise to do just that rather than attacking them. Drop four freeze blasts in his mouth and he's done for.

***End***

Or is it...