Drink served hot or cold
I believe the answer is:
tea
'drink served hot or cold' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tea that I've seen before include "For Japanese ceremony" , "Assam or Darjeeling, for example" , "grass" , "Provide a meal" , "- - for Two (song)" .)