One resisting change: Hera did somehow (3-4)
I believe the answer is:
die-hard
'one resisting change' is the definition.
The definition suggests a singular noun but the answer is not.
'hera did somehow' is the wordplay.
'somehow' indicates anagramming the letters.
'hera'+'did'='heradid'
'heradid' is an anagram of 'DIE-HARD'.
Can you help me to learn more?
(Other definitions for die-hard that I've seen before include "Obstinately resistant to change" , "Obstinate or dauntless person" , "Person who insists on holding traditional views" , "Ultra-conservative" , "Obstinately conservative" .)