Doctor teaches it, concerned with beauty (9)
I believe the answer is:
aesthetic
'concerned with beauty' is the definition.
(I've seen this before)
'doctor teaches it' is the wordplay.
'doctor' indicates an anagram.
'teaches'+'it'='teachesit'
'teachesit' with letters rearranged gives 'AESTHETIC'.
(Other definitions for aesthetic that I've seen before include "Of pleasing appearance" , "Concerned with the appreciation of beauty" .)