Hi,
these compatibility lists are really only "guidelines" as each fish has its own personality traits.
I have a butterfly who was being chased by an angel, when i added a fire goby the butterfly stoped being chaised, but started chaseing the fire goby...
***)
so here is the thing, unless your clown is exibiting signs of stress i would not worry too much about it.
things you can do:
get another goby;as they will school
get another clown, as they like to pair up.
rearange your rock
do nothing and hope for the best.
also it would help if you posted your tank size, because some fish are more treritorial than others.
also you will need, or should have a hole for your goby to hide in and sleep in.
goodluck
-oozy-