Beer is brought inside passage (5)
I believe the answer is:
aisle
'passage' is the definition.
(aisle is a kind of passage)
'beer is brought inside' is the wordplay.
'beer' becomes 'ale' (type of beer).
'brought inside' indicates putting letters inside.
'ale' enclosing 'is' is 'AISLE'.
(Other definitions for aisle that I've seen before include "Passage between seating areas" , "Path between seats in church" , "Way between seat blocks" , "Part of supermarket" , "that would-be bride hopes to make it up!" .)