[Metacelsus]

Anecephaly is a thing. Though those babies don't survive much past birth.

[graemep]

Most do not, which suggests to survive to adulthood more of a brain will be needed.

Some anacephalic babies survive for months, even years and function mentally: https://www.dailymail.co.uk/news/article-2226647/Nickolas-Co...

I am very sceptical that you could create a clone with enough of a brain to survive and guarantee the clone will have no awareness.