showing an attribute of a foreign key in admin

copied and pasted from stackoverflow, since i didnt get an answer in a
week and i just can't believe its not possible.

I want to display the Level of the Category that the product belongs
to, in the admin page for the Product. snipped a lot of the
unimportant fields out of the display below.

class Category(models.Model):
name = models.CharField(max_length=50, default=False)
level = models.IntegerField(help_text="1, 2 ,3 or 4")

class Product(models.Model):
category = models.ForeignKey(Category)
name = models.CharField(max_length=100)

prepopulated_fields = {'slug': ('name',)}
fieldsets = [
('Product Info',{'fields': ['name',
'slug','partno','description']}),
('Categorisation',{'fields': ['brand','category']}),

obviously i've tried a little to get this working and googled a lot,
but i've found reference to list_filter lots, but nothing about just
showing the field. best guess was
'category__level' inside the fieldset as a field, but that didnt work.

anyone know the right way to do this?

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