Burn tea, we hear (4)
I believe the answer is:
char
'burn' is the definition.
(charring is a kind of burning)
'tea we hear' is the wordplay.
'tea' becomes 'cha' (cha is a type of tea).
'we hear' becomes 'r' (I can't explain this - if you can you should believe this answer much more).
'cha'+'r'='CHAR'
Can you help me to learn more?
(Other definitions for char that I've seen before include "Partially burn; fish" , "Tea - cleaning lady" , "'Mrs Mopp'" , "(Work as a) cleaner" , "Perhaps overheat" .)