Oolong or pu'er (3)
I believe the answer is:
tea
'oolong or pu'er' is the definition.
(I know that oolong is a type of tea)
This is all the clue.
(Other definitions for tea that I've seen before include "Assam or Darjeeling, for example" , "grass" , "Early evening meal" , "Beverage; meal" , "Cuppa" .)