All are crazy about English beer (4,3)
I believe the answer is:
real ale
'beer' is the definition.
(I've seen this before)
'all are crazy about english' is the wordplay.
'crazy' is an anagram indicator.
'about' means one lot of letters goes inside another.
'english' becomes 'e' (abbreviation).
'all'+'are'='allare'
'allare' anagrammed gives 'ralale'.
'ralale' enclosing 'e' is 'REAL ALE'.
(Other definitions for real ale that I've seen before include "Beer fancier's drink" , "Traditional beer" , "Objective of campaign" , "The RA in CAMRA" , "Beer fermented in cask, served without carbon dioxide" .)