17 down
One
no
longer
believing
in
a
job
caused
worry
(8)
One no longer believing in a job caused worry (8)
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hints
The definition is at the beginning of the clue.
How the clue works
The definition is one no longer believing — someone who's abandoned their faith. Then the wordplay builds it up: "a" gives you A, job clues POST (a position or role), and caused worry gives ATE (as in something "ate at" you), so A plus POST plus ATE gets you there.