Adopts two-point post office uses (8)
I believe the answer is:
espouses
'adopts' is the definition.
('espouse' can be a synonym of 'adopt')
'two-point post office uses' is the wordplay.
'two point' becomes 'es' (I can't explain this - if you can you should believe this answer much more).
'post office' becomes 'po' (abbreviation).
'es'+'po'+'uses'='ESPOUSES'
Can you help me to learn more?
(Other definitions for espouses that I've seen before include "Marries, embraces" , "Chooses and follows" , "Takes up" .)