Obtain favourable treatment (7)
I believe the answer is:
procure
'obtain' is the definition.
(I've seen this before)
'favourable treatment' is the wordplay.
'favourable' becomes 'pro' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'treatment' becomes 'cure' (cure is a kind of treatment).
'pro'+'cure'='PROCURE'
Can you help me to learn more?
(Other definitions for procure that I've seen before include "Obtain; solicit" , "Get by special effort" , "Acquire" .)