Champion prop getting in beer (7)
I believe the answer is:
apostle
'champion' is the definition.
(apostle is a kind of champion)
'prop getting in beer' is the wordplay.
'prop getting' becomes 'post' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' is an insertion indicator.
'beer' becomes 'ale' (type of beer).
'post' inserted into 'ale' is 'APOSTLE'.
Can you help me to learn more?
(Other definitions for apostle that I've seen before include "Thaddeus, perhaps" , "Religious messenger" , "Missionary or evangelist" , "Originally, one sent to preach the gospel" , "Disciple of Jesus Christ" .)