Private patients are treated here (6)
I believe the answer is:
inward
'private' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for inward that I've seen before include "Situated on the inside" , "In the mind or spirit, not outside" , "Towards the centre" , "Formerly private" , "Existing in the mind - to the centre" .)