Crazy about English drink (4)
I believe the answer is:
mead
'drink' is the definition.
(mead is a kind of drink)
'crazy about english' is the wordplay.
'crazy' becomes 'mad' ('mad' can be a synonym of 'crazy').
'about' means one lot of letters goes inside another.
'english' becomes 'e' (abbreviation).
'mad' placed around 'e' is 'MEAD'.
(Other definitions for mead that I've seen before include "Honey-based alcoholic drink" , "Honey drink; lea" , "Honey wine" , "Alcohol" , "Old honey-based drink for dame" .)