Be very angry (4)
I believe the answer is:
fume
'be very angry' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for fume that I've seen before include "Emit vapour" , "A - cupboard may be found in chemistry lab" , "Feel great anger" , "Smoulder with rage" , "Smoke and be angry" .)