Leaves in hot water? (3)
I believe the answer is:
tea
'leaves in hot water' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tea that I've seen before include "Oolong, for example" , "Infusion of dried leaves" , "Hot drink" , "Afternoon meal; drink" , "Light afternoon meal" .)