I would not be so quick to send the little guy packing just yet, I'd give it a little time, I'm sure everyone would agree that some new fish are picked on when they are first introduced to the tank.
From what I have been told on this site, the larger clown will be the dom. female and the smaller of the two will become the male. Strange how nature works.
From my own experience we have had a clarkii clown for almost 4 years, we decided to get another in the hopes of breeding, our big girl picked on the little guy for a good week and finally took to him like white on rice, they even shared her anomne. Sadly are little guy passed when we had a rock slide, he didn't move fast enough. (slide was caused from sfe after we added new rock).
In the end the decision is yours, good luck in what ever you choose. Lisa