Drink with king in tree (4)
I believe the answer is:
teak
'tree' is the definition.
(I know that teak is a type of tree)
'drink with king' is the wordplay.
'drink' becomes 'tea' (tea is a drink).
'with' means one lot of letters go next to another.
'king' becomes 'k' (abbreviation for king in chess).
'tea'+'k'='TEAK'
'in' is the link.
(Other definitions for teak that I've seen before include "Take to the hardwood" , "Hard wood for Kate" , "Hard durable timber" , "Type of wood" , "Strong heavy wood of an Asian tree" .)