### Clue: Support a medic keeping very active by country's borders (8)
### Answer: ADVOCACY 
 ### Explanation: Definition: Support
 [ A + DOC(short for "doctor";a medic) **containing**(keeping) V(abbrev. for "very") ] + A(abbrev. for "active", in acronyms for various terms, such as "Active Participation"?) **plus**(by) **the 1st and last letters of**(…'s borders) "country".
Defn: … for a cause or proposal.