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Ore
obtained
by
worker
underground,
a
trainee
(7)
Ore obtained by worker underground, a trainee (7)
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The definition is at the beginning of the clue.
How the clue works
Right, so Ore at the start is your definition — that's the mineral rock stuff metal comes out of. For the wordplay, take MINER (a worker underground), then bolt on A, then finish with L, which is the standard abbreviation for a learner or trainee. Stick MINER, A and L together and you've got your answer.