Pair refusing to fight over a drink (5)
I believe the answer is:
cocoa
'a drink' is the definition.
(cocoa is a kind of drink)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for cocoa that I've seen before include "Light brown" , "Powdered cacao seeds" , "Hot beverage" , "Chocolaty drink" , "Nighttime drink" .)