Be watchful for redness and/or white tuff's. Both would be signs of infection setting in. Do a few good sized water changes with well aged/aerated
SW and feed with a quality vitamin high in
[acronym="Highly Unsaturated Fatty Acid"]HUFA[/acronym] and the clown should recover just fine. The fin should heal properly where bone was not damaged. Bone damage will typically not grow back properly but flesh and cartilage will.
Cheers
Steve