Rage about equipment (4)
I believe the answer is:
gear
'equipment' is the definition.
(I know that gear is a simple machine)
'rage about' is the wordplay.
'about' indicates anagramming the letters.
'rage' is an anagram of 'GEAR'.
(Other definitions for gear that I've seen before include "Trendy clothes - changed in car?" , "Toothed wheel used when changing speed" , "Toothed wheel which engages with another one" , "Unusually good" , "Clothes (first or second, perhaps?)" .)