Is it not used in general medicine? (8)
I believe the answer is:
specific
'medicine?' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for specific that I've seen before include "Particular, definite" , "Well-defined" , "Particular, exact" , "medieval drug" , "Relating uniquely to a subject; precise, clear" .)