One who doesn't like spending years in wretched state (6)
I believe the answer is:
misery
'wretched state' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for misery that I've seen before include "Woe, wretchedness" , "Great suffering" , "Mental distress or discomfort" , "Party-pooper" , "''. . . . . . loves company''" .)