In the situation where you have a currently mature clone from the Clone spell, die, transfer to your clone, and then manage to go back and recover your previous body, is that body potentially a candidate for becoming an undead minion, such as with the Create Undead spell?
You should be able to raise your own, other, body.
Clone only states that your other body is "inert and cannot be brought back to life", not that it is no longer a corpse.
The requirement for Create Undead?
You can cast this spell only at night. Choose up to three corpses of Medium or Small humanoids within range. Each corpse becomes a ghoul under your control.
So, our checklist looks something like this:
- 6th level spell slot? [check]
- one corpse? [check]
You are the proud new owner of a screaming, howling, baby clone ghoul abomination.
When your soul leaves your body to go into the Clone, the following happens to the original (emphasis mine):
The original creature's physical remains, if they still exist, become inert and can't thereafter be restored to life, since the creature's soul is elsewhere.
Create Undead simply states:
Choose up to three corpses of Medium or Small humanoids within range.
Create Undead is not restoring life, it is creating undead. Undead does not equate to alive (as restore to life generally is referring to Revivify, Resurrect, etc.)
In this case, you may visit your old body and make it a Ghoul.