18 across
Read
about
the
origin
of
law
throughout
sailor’s
trials
(7)
Read about the origin of law throughout sailor’s trials (7)
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The definition is at the end of the clue.
How the clue works
trials is your definition here. Take Read, the first letter of law ("the origin of law"), and sailor (OS, ordinary seaman), then let about signal a shuffle of READ, L, and OS to get your answer.