Criminal charge concealed by people in authority responsible for treatment (7)
I believe the answer is:
therapy
'treatment' is the definition.
(I know that therapy is a type of medical aid)
'criminal charge concealed by people in authority' is the wordplay.
'criminal charge' becomes 'rap' (as in taking the rap for something).
'concealed by' is an insertion indicator.
'people in authority' becomes 'they' ('they' can mean unspecified powerful forces).
'rap' going within 'they' is 'THERAPY'.
'responsible for' acts as a link.
(Other definitions for therapy that I've seen before include "Curative treatment" , "Healing treatment" , "Remedial treatment" , "Relieving treatment" , "They rap (anag.)" .)