Star heartily imbibing eastern drink (3)
I believe the answer is:
tea
'drink' is the definition.
(tea is a kind of drink)
'star heartily imbibing eastern' is the wordplay.
'heartily' means to look at the middle letters.
'imbibing' means one lot of letters goes inside another.
'eastern' becomes 'e'.
The middle of 'star' is 'ta'.
'ta' placed around 'e' is 'TEA'.
(Other definitions for tea that I've seen before include "Afternoon or evening meal" , "Elevenses" , "brewer's product" , "Shrub; drink" , "tips for the cup?" .)