Finding it strange to be out of a job (6)

I believe the answer is:
unused
'out of a job' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I can't see?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for unused that I've seen before include "factory fresh" , "Mint, virgin" , "In mint condition" , "Pristine" , "Still in wrapper?" .)
