Course of treatment from doctor, e.g., I mentioned (7)
I believe the answer is:
regimen
'course of treatment' is the definition.
(I've seen this before)
'from doctor e g i mentioned' is the wordplay.
'from' indicates a hidden word.
'REGIMEN' can be found hidden inside 'doctor e g i mentioned'.
(Other definitions for regimen that I've seen before include "Systematic course of treatment, diet, etc" , "discipline" , "Therapeutic programme (of diet and exercise)" , "Prescribed system of diet and exercise - mere gin (anag)" , "That's what doctor orders" .)