A friend for tea (4)
I believe the answer is:
mate
I believe this clue is a double definition.
'a friend' is the first definition.
(mate is a kind of friend)
'tea' is the second definition.
(South American hot drink)
'for' acts as a link.
(Other definitions for mate that I've seen before include "Fellow worker" , "Friend; chess move" , "Friend, buddy" , "Final check at chess" , "Ship's officer or marital partner" .)