A Pre-Clear is any person that still possesses Anxieties or Psychosomatic Illnesses.
In our Order, this condition could easily be present in any Degree of Consciousness, but is most present in the lower degrees. As members advance through the degree system, using whatever techniques are appropriate for their chosen Path, they naturally shed the various things that cause Aberration.
The Dianetic (Scientology) Process for removing these things is called Auditing.