Yeap, my clown is pretty stealthy as well.
I can usually coax him out with an algae tab though.
Also just wonderin', what type of driftwood do you have in the tank? I noticed when I had a no-name piece of driftwood, he wouldn't go near it. Now I took that out and added a piece of Malaysian driftwood to the tank and I can't get him off of it =p