Brook providing drinks outside the church (7)

'brook' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'drinks outside the church' is the wordplay.
'drinks' becomes 'beers' (beer is a kind of drink).
'outside' indicates putting letters inside (some letters go outside others).
'the church' becomes 'ch' (abbreviation on maps etc).
'beers' placed around 'ch' is 'BECHERS'.

'providing' is the link.

Can you help me to learn more?