Crazy about eastern honey-based drink (4)
I believe the answer is:
mead
'honey-based drink' is the definition.
(I've seen this before)
'crazy about eastern' is the wordplay.
'crazy' becomes 'mad' ('mad' can be a synonym of 'crazy').
'about' indicates putting letters inside.
'eastern' becomes 'e'.
'mad' placed around 'e' is 'MEAD'.
(Other definitions for mead that I've seen before include "Male shop worker" , "Cornish drink" , "sweet drink" , "something to drink" , "Alcohol" .)