Course of treatment keeps one away from work (4,4)
I believe the answer is:
rest cure
'course of treatment' is the definition.
'rest-cure' can be an answer for 'treatment' (rest-cure is a kind of treatment). I'm not sure about the 'course of' bit.
'keeps one away from work' is the wordplay.
'keeps one away' becomes 'rest' (I can't explain this - if you can you should believe this answer much more).
'from' is a charade indicator (letters next to each other).
'work' becomes 'cure' (cure is a kind of work).
'rest'+'cure'='REST-CURE'
Can you help me to learn more?
(Other definitions for rest cure that I've seen before include "Therapeutic break" , "Treatment involving peace and quiet" , "Type of treatment" , "Prolonged period of relaxation as medical treatment" , "remedy for stress?" .)