Making a clone run a function from a variable

The issue you're facing goes in line with this topic

And also, you shouldn't need to create variables programmatically, you can just add to a list. If you have a reason to use the create var block, then I'd like to hear why.

To get your script to work, just do this

tell (object [myself]) to (item (3) of (var(ownpart)))

(Sorry, I didn't want to create the script in snap).

And if you're thinking, why would I have to do this? I agree. A sprite should not need to tell itself to run a script from a variable.