more steamed (6)
I believe the answer is:
madder
'more steamed' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for madder that I've seen before include "More wild; plant yielding red dye" , "Plant; more insane" , "Dye-yielding plant" , "more bananas" , "Plant; more angry" .)