Outbreak is equally reckless (4)
I believe the answer is:
rash
This might be a double definition.
'outbreak' is the first definition.
(rash can mean a sudden outbreak)
'equally reckless' is the second definition.
'rash' can be an answer for 'reckless' (synonyms). I am not certain of the 'equally' bit.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for rash that I've seen before include "Foolhardy about the skin infection" , "Ill-considered - break-out" , "Impulsive, having skin ailment" , "Eruption on skin, imprudent" , "Hasty; series of things" .)