Burn the tea (4)
I believe the answer is:
char
This clue is a double definition.
'burn' is the first definition.
(charring is a kind of burning)
'the tea' is the second definition.
(I've seen this before)
(Other definitions for char that I've seen before include "Become black by burning" , "Burn; scorch" , "way to make carbon" , "House cleaner" , "Partially burn; fish" .)