What does the cryptic crossword clue "Built an oil rig that's not been done before (8)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Built an oil rig that's not been done before (8)

Guardian Cryptic #27247 | 24 Across | 2017-07-12 flower

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