Part of church is surrounded by beer! (5)
I believe the answer is:
aisle
'part of church' is the definition.
(I've seen this before)
'is surrounded by beer' is the wordplay.
'surrounded by' indicates putting letters inside.
'beer' becomes 'ale' (type of beer).
'is' placed within 'ale' is 'AISLE'.
(Other definitions for aisle that I've seen before include "Passageway between pews" , "The way to get married in church?" , "Extension of the nave in a church" , "Passage between seating blocks" , "way to the altar?" .)