Eat; drink (3)
I believe the answer is:
sup
This clue is a double definition.
'eat' is the first definition.
(supping is a kind of eating)
'drink' is the second definition.
(to sup is to drink)
(Other definitions for sup that I've seen before include "Take food" , "Eat a late meal; sip" , "Drink; eat evening meal" , "A mouthful of liquid" , "Imbibe" .)