Follow this thread and your get some extra information.
About clipped channels.
If you have FRV or Rawdigger you can check if a rawfile has clipped data channelwise.
The recoverable whites and blacks and saturated colors are out the chosen colorspace but stil inside the rawdata’s colorspace. If not you can’t recover only replace.
By using the clone or repair tool you can use donor places to fill the wasted spots/area’s. Basicly add detail back in to the place.
Sunspots, reflectionsflashes that kind of things.
With feathering and opacity you can smooth the edges.