Surrounding a doctor - that is by the book (7)
I believe the answer is:
ambient
'surrounding' is the definition.
(synonyms)
'a doctor that is by the book' is the wordplay.
'doctor' becomes 'MB' (Bachelor of Medicine, Medicinae Baccalaureus).
'that is by the book' becomes 'ient' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'mb'+'ient'='AMBIENT'
Can you help me to learn more?
(Other definitions for ambient that I've seen before include "relaxing type of music?" , "Bait men to find surrounding, say, light" , "Surrounding - mean bit (anag)" , "Surrounding or encircling, say temperature" , "Going round" .)