You could use a tupperware of some kind and flip it over top of the elegance to seperate it from the clowns. i would drill a few hole sin it to allow a little flow while feeding.
In all honestly though, clwon housing in an elegance usually ends up with the demise of the elegnace. They (elegance) dont like to be bothered when open, while frogspawn and hammer generally dont mind it as much, plus the latter generally have multiple heads while an elegance generally is one large head. If the clowns prevent the elegance from fully expanding, you'll have to seperate them.