Extremely mad (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
irate
'extremely mad' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for irate that I've seen before include "having got in wax" , "Indignant, angry" , "Annoyed, irritated" , "Livid" , "Aggrieved" .)