Is it safe to clamp an angle grinder and bring the work to the tool?
I do not think anyone should recommend that someone try clamping an angle grinder to a table rather than buying the correct entry-level tool (a bench grinder).

While clamping an angle grinder to a table could probably be done, the effort and skill required to make a clamping jig that reliably holds an angle grinder in place is high and the risks of doing it wrong are even higher. The jig likely requires wood or steel working tools where you would have already had a bench grinder in your shop for years before buying the tools required to make a jig to clamp an angle grinder.

To outline the risks: Basically, if the grinder comes loose while you are working with your fingers next to it, then your fingers are instantly a mangled mess either by the blade or by getting them crushed in the spindle.