I've seen very young ocellaris host everything from condys to florida rock/flower nems to ricordea.
I would NOT count on it though.
As mentioned above, the condy may eat your clown, and that's a sad price to pay.
Consider that (at least in my area) you can buy a nice BTA for around $40, and a clown is $20, so if you are eyeballing the condy b/c it's cheaper, it may NOT be cheaper in the long run.