Angry, furious (6)
This clue is a double definition.
'angry' is the first definition.
(similar in meaning)
'furious' is the second definition.
(I've seen this before)
(Other definitions for mad that I've seen before include "like the March Hare" , "Deranged" , "lunatic" , "Insane - furious" , "Angry or insane" .)
(Other definitions for ireful that I've seen before include "mad" , "Showing resentment" , "Full of wrath" , "very cross" , "Angry" .)