Beer enthusiasts about to drink a good new brandy (8)
I believe the answer is:
armagnac
'brandy' is the definition.
(I know that Armagnac is a type of brandy)
'beer enthusiasts about to drink a good new' is the wordplay.
'beer enthusiasts' becomes 'CAMRA' (Campaign for Real Ale).
'about' says the letters should be written in reverse.
'to drink' means one lot of letters goes inside another.
'good' becomes 'g' (abbreviation).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'camra' in reverse letter order is 'armac'.
'a'+'g'+'n'='agn'
'armac' placed around 'agn' is 'ARMAGNAC'.
(Other definitions for armagnac that I've seen before include "Dry brandy from south-west France" , "Kind of brandy" , "Brandy traditionally made in Aquitaine" , "Liquor" , "Type of brandy" .)