All are drunk having imbibed English beer (4,3)
I believe the answer is:
real ale
'beer' is the definition.
(type of beer)
'all are drunk having imbibed english' is the wordplay.
'drunk' indicates an anagram.
'having imbibed' is an insertion indicator.
'english' becomes 'E' (abbreviation).
'all'+'are'='allare'
'allare' anagrammed gives 'ralale'.
'ralale' placed around 'e' is 'REAL ALE'.
(Other definitions for real ale that I've seen before include "beer making" , "Bitter, possibly" , "Beer fancier's drink" , "Pub drink" , "The RA in CAMRA" .)