Serve drinks (4)
I believe the answer is:
pour
'serve drinks' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pour that I've seen before include "(Of rain) fall heavily" , "16 [CATS AND DOGS]" , "Cause to flow in a stream" , "Teem" , "Cause to flow as from pot to cup" .)