Cooks in a bamboo basket (6)
I believe the answer is:
steams
'cooks in a bamboo basket' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for steams that I've seen before include "Rises as vapour" , "Cooks using evaporated water" , "Emits vapours" , "Cooks with water vapour" .)