Post-op therapy (5)
I believe the answer is:
rehab
'post-op therapy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rehab that I've seen before include "getting dry?" , "Treatment for addicts (abbrev.)" , "remedial treatment" , "Treatment for alcoholism" , "A herb (anag.)" .)