Sufferer’s energy conserved by citrin regularly (6)
I believe the answer is:
victim
'sufferer's' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for victim that I've seen before include "Person who suffers accident or crime" , "Casualty, injured party" , "Casualty of a crime" , "sacrificed animal" , "One suffers from adverse circumstances" .)