Had ingrown toenail removed. i have fungus on other toes including one that had ingrown.that nail is peeling back and has some fungus. should i clip?

Yes it's ok: Between the nail service in itself, and the fact that this nail has fungal changes, both tend to loosen the nail plate from the nail bed. So the nail doesn't lossen more, trim it. It'll be okay. Certainly, you don't wanted to rip from a sock or bedsheet.

Yes.: If you are able to, you can remove any loose fungal nail. Have it evaluated by a professional and get the appropriate anti fungal treatment.