Served up beer no-one's consumed within district (8)
I believe the answer is:
regional
'within district' is the definition.
(within a region)
'served up beer no-one's consumed' is the wordplay.
'served up' says the letters should be written in reverse (in a down clue, letters go up).
'beer' becomes 'lager' (type of beer).
'one' becomes 'i' (Roman numeral).
'consumed' is an insertion indicator.
'no'+'i'='noi'
'lager' placed around 'noi' is 'lanoiger'.
'lanoiger' backwards is 'REGIONAL'.
(Other definitions for regional that I've seen before include "Relating to a specific area of the country" , "Characteristic of an area" , "Like some food" , "Territorial" , "Relating to local area" .)