Personal routine is GP's business, perhaps (7,8)
I believe the answer is:
private practice
'gp's business perhaps' is the definition.
I can't tell whether this definition defines the answer.
'personal routine' is the wordplay.
'personal' becomes 'private' (personal can mean private or individual).
'routine' becomes 'practice' (I've seen this before).
'private'+'practice'='PRIVATE PRACTICE'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for private practice that I've seen before include "Basic army training" , "no NHS concern" , "professionally lucrative?" .)