I have a female pink skunk with a turning male percula in a small cube right now. She is starting to accept him, but it is an uphill battle for the little guy. I would recomend getting the second largest of a healthy batch of whatever type of clown you chose and see how it goes. Have a backup plan if they really don't get along and protect them from being able to jump out. Don't skip the QT though.
<table style="width:auto;"><tr><td><a href="http://picasaweb.google.com/FlightyMail/Clown/photo#5005988744394024114"><img src="http://lh3.google.com/image/FlightyMail/RXjYPXs1pLI/AAAAAAAACUI/5G-IUvEt_kg/s288/DSC04258.JPG"></a></td></tr><tr><td style="font-family:arial,sans-serif; font-size:66%; text-align:right">From <a href="http://picasaweb.google.com/FlightyMail/Clown">clown</a></td></tr></table>