Fish for tea (4)
I believe the answer is:
char
I believe this clue is a double definition.
'fish' is the first definition.
(char is a kind of fish)
'tea' is the second definition.
(I've seen this before)
'for' is the link.
(Other definitions for char that I've seen before include "clean > burn" , "Partly burn - cleaning woman" , "Scorch, small fish" , "tea > daily" , "Blacken by burning" .)