Doctor's order (5)
I believe the answer is:
rehab
'doctor's order' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rehab that I've seen before include "getting dry?" , "Restorative care" , "Place to go, in short, to be restored to fitness" , "Treatment centre (abbrev.)" , "Treatment for alcohol or drug dependence" .)