Winter drink (5)
'winter drink' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cocoa that I've seen before include "Milky hot drink" , "Powder from cacao beans" , "Hot bedtime drink" , "Chocolaty drink" , "Reddish brown" .)
(Other definitions for eggnog that I've seen before include "spirits in me?" , "Yellowish mixed alcoholic drink" , "Kind of sweet punch" , "Punch made with eggs and alcohol" , "Christmas drink" .)