He believes in beer-bottling station (7)
I believe the answer is:
apostle
'he believes' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'beer-bottling station' is the wordplay.
'beer' becomes 'ale' (type of beer).
'bottling' is an insertion indicator (bottling is a kind of containing).
'station' becomes 'post' (synonyms).
'ale' placed around 'post' is 'APOSTLE'.
'in' is the link.
Can you help me to learn more?
(Other definitions for apostle that I've seen before include "Ale pots (anag)" , "Advocate" , "One of the biblical twelve (7)well don" , "Champion - one of twelve" , "Vigorous supporter" .)