What may be taken innocently with unknown treatment (7)
I believe the answer is:
therapy
'treatment' is the definition.
(I know that therapy is a type of medical aid)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for therapy that I've seen before include "They rap (anag.)" , "Healing treatment" , "will do you good" , "Medical treatment" , "Remedial treatment" .)