Those people must accept charge for treatment (7)
I believe the answer is:
therapy
'treatment' is the definition.
('therapy' can be a synonym of 'treatment')
'those people must accept charge' is the wordplay.
'those people' becomes 'they' (I've seen this before).
'must accept' is an insertion indicator.
'charge' becomes 'rap' (I have seen 'Criminal charge ' mean 'rap' so perhaps 'charge' could also mean 'rap').
'they' enclosing 'rap' is 'THERAPY'.
'for' is the link.
(Other definitions for therapy that I've seen before include "healing process" , "Medical treatment" , "Treatment designed to cure illness or disability" , "Relieving treatment" , "See 7" .)