Actually clowns are born without gender. The most dominant clown becomes female, the next dominant clown becomes male, and the rest stay as ungendered "males in waiting." However, as it's rare to get a group of clowns to take on this hierarchy in captivity, most often in our tanks we get a female, a male, and a group of outcasts that will eventually be killed off by the dominant pair.
Killagoby - Approximately how big is the Ocellaris clown you just got? Do you know if it was Captive Bred or Wild Caught? Do you know how long the LFS had it, and if it was in a tank with other clowns at the store?