I have a Psychology degree and PhD, and worked in different University Psychology Departments as a Research Fellow or Lecturer.
A-level Psychology is not an entrance requirement because few schools offer the subject. Biology or Maths would be more suitable. And the subject matter is so narrow and watered down at A-level to be very different to what is taught in the degree. Psychology is a wide field.
True, very, very, very few graduates actually work as a Clinical Psychologist or similar.
If the degree has a science rather than social science slant, graduates will learn a reasonable amount of statistics and research methods, which is my experience of what they will tend to use in graduate jobs. I left academia to work in analytical/statistical positions in NHS, public sector and now Government