In favour of treatment if they can get it (7)
I believe the answer is:
procure
'they can get it' is the definition.
The definition suggests an adverb but the answer is not.
'in favour of treatment' is the wordplay.
'in favour of' becomes 'pro' (being pro a particular cause).
'treatment' becomes 'cure' (medical treatment).
'pro'+'cure'='PROCURE'
'if' acts as a link.
Can you help me to learn more?
(Other definitions for procure that I've seen before include "Acquire" , "Obtain; solicit" , "Get by special effort" .)